I think there are 2 points here.
First, about Machine Learning on PS5: as you know, Machine Learning tasks are software implementations, it's not a question if exists or not exists in a specific platform. Microsoft has DirectML API, Vulkan has their own ML API, and obvious Sony would adapt for the PS5. PS5 should have int4 and int8 operators. Even PS4 Pro has FP16 operators, and these integer operators exists since RDNA 1. The white paper is available to read about. I cannot confirm about PS5, MS did a better job in hardware marketing than Sony, but PS5 without int8 could be big surprise.
Second, about Xbox Series X power to run Machine Learning. As you know, I can write ML code to my game and do the matrix net calculations in CPU, GPU, whatever. But for gaming i need performance in real time. I can have this ML performance in your GTX 770, but maybe in PS2 game graphics. The point is, XSX has 97 TOPs to use int4 low precision operators, but this number is unreal, because if i use 97 TOPs to ML, there is no shader left to render the game. Of course if remains 30 TOPs int4 to ML, it's better than nothing, but too far away the tensor cores performance. As i said, ML/DL will have interesting improvements in consoles, but i don't believe in miracles.