Isn't there something in canon regarding Time Lord being made in looms? As well as the doctor being a reincarnation of Omega and one of the three founding fathers of the Time Lords.
Canon has been jumbled around and rewritten and tried to be corrected so many times I'm looking forward to how they're going to explain this. Just a shame this is possibly the only episode I've enjoyed of Jodie.
It's in some of the books if I remember right. After the population of Gallifrey became sterile through some mystical mumbo-jumbo curse placed on them that I can't remember details of now. And potentially very exciting if it can be adapted well.
The big issue, is that there is no confidence in this current crew of writers and producers in being able to do that proper justice without just making it all a bunch of incompatible nonsense with what's gone before.
The key problem here is, the books note that The Doctors Granddaughter; Susan, recognised The First Doctor (Hartnell) as her Grandfather, not as family, but Grandfather. She wouldn't have asked for "Grandfather" but "Grandmother", but I suppose you could just hand wave this as Susan already knowing that this person from the Looms is the reincarnation of her Grandmother and now because is a male, should be called Grandfather. But, since you would want to call someone by what they remember you calling them by; and in that case, it would be Grandmother, not Grandfather which was used, this would make it unlikely to be compatible logic wise within the story. And she was one of the last of the Gallifreyans that was "born". So it would be difficult to reconcile that difference with a "previous" Doctor to Hartnells First Doctor, since he was not the first to have been produced via The Looms (acording to the books).
Note, that I too found the potential to be exciting and with potential, but... We've all seen this before. With Episode VII. Lots of potential there. Then came VIII. And it was all over, whilst screwing over the past stuff at the same time. That is the concern here, because we have a poor group of writers here who seem hell bent on pushing certain types of messages through at the expense of writing or adapting something amazing instead of just going for the amazing writing and adapting. Just using Hand Waving isn't good writing, and neither is using the fact that The Doctor and Time Lords can regenerate and have more regenerations given to them, or are infite, because that just means you can constantly use more Hand Waving to write poor stories whilst breaking old lore and story.
Now, if they can actually take this story, run with it, AND stick to the landing. It'll be amazing. Just like I said about Joker (DC Joker details was never needed to be linked to the story, it stood on its own). Beating a dead horse now, but... Again. The current lot doesn't inspire confidence they can run with it, much less stick the landing.