Isn't the most genetically superhuman pure woman still gonna be physically weaker/slower than the most genetically superhuman pure man ... ?
Auramite armour the best !
Not gonna lie they are one of the most meh factions after dark eldar for me...
No reason for them to be, and IIRC custodes are as much about speed and agility as strength.
Also at the level the Custodes are at, the starting point as male/female humans is probably going to be a rounding error in the performance level - if you can boost performance of the body by tens or hundreds of times, and make them practically immortal (short of death in service or suicide when they feel they've lost peak performance), the difference in starting strength is going to be absolutely minimal if at all, especially fi you're controlling the growth of the body from birth/infant
Remember Custodes are individually tailored from infants, whilst marines are hitting puberty or later before they get chosen and have gross genetic patching with a high self sustaining element. IIRC in normal humans most of the difference in size/strength tends to kick in as puberty hits.
GW Female custodes meh!!
They look like dudes an have no boobie armour so what’s the point!!
Bring on the 3rd party sculpts
The fun bit is they're pretty accurate to actual historical female armour in how similar the two sets are

. Although both are closer to display/vanity/court armour in look than real combat armour.
Most real, female armour sets are extremely similar to male armour if built for function rather than display (in the same way most kings had some very fancy armour for court/vanity, they also had armour that was often much simpler for battle), as male armour was worn over a lot of padding and often gently curved and sculpted to direct glancing blows away from vital areas, and female armour would have been nuts to have the typical fantasy boob plates because they direct glancing blows into vital areas. So between the layers of padding, the gaps between the armour and the flesh and breasts being reasonably squishy (and realist sizes rather than appealing to teenage boys) the shape of armour was about the same, with any feminine looks often being in relatively minor styling changes rather than major structural ones.
If you look at proper space suits* or modern kevlar armour sets there still isn't a massive difference in shape between male and female most of the time, as the materials and hazards might change but the physics and general issues stay pretty much the same, just the impacts are harder and the "armour" better at dealing with it.
That’s been the case for ages, lots of incels and various other cretins had a meltdown about it but ultimately got drowned out by people who aren’t weird about women.
Though it was often argued about under the guise of “lore”, which any 40K fan should know changes on a whim. There was even a female one from a game’s workshop animated series they did last year or the year before.
The bit that made me laugh were the arguments about the "lore" being sons. When the total lore at that point was meant to be a quote from one person who had no insider knowledge of the custodes other than that some nobles sons had been taken to become some custodes at one point in time in one place, meanwhile about the only other bit of lore was that they were vastly superior to Space Marines and every one of them had been individually created,.
Meanwhile the the lore for marines goes into great detail about why Space Marines were always men and even why some chapters recruit from very limited pools of candidates (the candidates are matched to the existing seeds as the seeds can't be changed), and even then they have a high failure rate. And even that lore about SM's is retconned to a degree, there was a female marine/women in marine armour (later described as a Sister of Battle) in the first model catalogues for rogue trader, before they settled on the 40 factions.
The best bit is, as you say the 40k lore changes, and it's even acknowledged repeatedly across multiple editions that the Empire of Mankind doesn't even necessarily agree on what the year is, and there are vast holes in their records or knowledge either because it's lost completely, it's been forgotten (but they sometimes make contact with a system that remembers/something is found like partial STC's), it's been suppressed and the inquisition/mechanicus etc aren't telling anyone outside their group, or the only the people that use something know of it.
I'm saying all this, whilst having no intention of getting custodes, or playing 40k proper at the moment as I'm enjoying LI with my tiny tanks and chunky boys (my Tau, Nids and daemons haven't been out of their boxes in years).
*The ones with the cooling layer, the functional lawyer and then the outer protective layer, rather than the stuff that is basically intended to just give short term protection against a vacuum inside a space craft and might be little more than a lightly padded form fitting suit (even then you don't get highly distinct breast bulges as it increases complexity and introduces additional failure points).