If you read through the comments on the thread, that's actually why this works.
AMD sold binned PS5 chips to crytomining endeavors. They resold the boards on eBay for cheap. So there's a history of people tinkering with rejected PS5 chips from cheap eBay purchases. That work lead to amdgpu/Mesa support, which is why this guy has raytracing on a real PS5.
can't pass the link. something about spam on the wiki. no read only mode?!