Without more detail we can only assume, but I would imagine it working the same way that DLSS is (presumed?) to work.
Most of the upscaling is done by their TAA algorithm that’s a part of FSR3.1, then the image will be cleaned up with their “AI” component for more image stability.
Honestly I’d love to own it on PC, once they fix the lighting and stuff in it (or there’s a mod that does)