I never heard of Pexon so I checked Pexon website and I fell off my chair laughed my head off at the price of 24 pin ATX cable.
£45!!!
Peson do not have 16 pin 12VHPWR cable and I read their terms and condition confirmed they offer all products with 6 months warranty. Really terrible value, they probably will make and sell 12VHPWR cable for about £50 that will come with 6 month warranty. If cable melted after bought 7 months later and you screwed.
You can buy 16 pin 12VHPWR cable with 2 years warranty from Corsair for £19 soon when order button go live.
I found Thermaltake have 16 pin 12VHPWR Sleeved PCIe Gen 5 Splitter Cable compatible for old Thermaltake ATX 2.0 PSUs, a retailer listed it on pre-order for £9.99 with 1 year warranty and stock expected 30 October 2022.