This is not true at all.
On my side, I would like to point that the today HN thread ([1]) that discusses a paper GameNGen ([2]) that runs Doom with diffusion models was trained on TPUs.
I don't see a dependency on NVIDIA there.
If there's a more specific rebuttal to my original statement, please, don't hesitate to state it.
1. https://news.ycombinator.com/item?id=41375548