This is just full marketing . In fact none of both consoles are pure desktop GPU. Microsoft has their own costume solution and PS5 also has their own costume solution. But both are RDNA 2 in term of ALU and ipc gain. What made the difference is the API. Microsoft will be using most of DX 12 ultimate for RDNA 2, while PS5 will be using their own API GNM/GNMX for their costume RDNA 2.
The funny thing is Microsoft is just like to poke at console war, probably they don't have anything to hype beside spec /gamepass . Sony are full of thing to hype from controller, spec, games, etc.