I don't know if I believe this, but here's a possibility I've recently thought of.
What if -
The switch was originally supposed to get a pro version in 2021, to be replaced by a sequel around 2024-2025
but then the chip shortage caused them to kill the pro, because they wouldn't be able to sell it, so they made the OLED instead
and then took the pro chip they already made, asked Nvidia to bump it up, and plan to release it as a sequel in 2023 instead (due to the lower sales in 2022/2023 with no pro)
It would line up with the chip being rumored to be on 8nm, yet the leaked specs not looking like an 8nm device. It would explain all the rumors of a pro in 2021, that never happened. And it also fits in with Nintendo's sales projections. Nintendo expected to sell 25.5 million consoles in 2021, and it looks like sales will be more like 21-22m. If they expected to release a pro, I think they could have done the 25.5 they expected. And it makes business sense too. If you spent all this money on R&D for a pro GPU to get a 4k switch, why not just build off that and release is later, instead of throwing it out?