you can maybe explain that away with their beating MS in the USA, but globally, Sony have always had the stronger performance be it last gen or the gen before.
you can not just write off USA, cause USA is the biggest market (not counting China but consoles wise that is no-man land). so For Microsoft losing that market was a big hit and an big gain to PS4.
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To understand how bad really was PS4 vs Xbox, the same scenario but backwards (or close to it) would be:
XBTWO: Similar Specs and Output than PS5, Price Tag of 399$, Allows Xplay with PC/ Mobile/ Switch on all games.
PS5: Similar Specs and output than XBTWO, Price Tag of 500$ cause they are force bundling PSVR whether you like it or not, your online experience is also limited to only other PS5 users, and an spokeman person saying "if you want to play with everyone else, you should buy something else then"
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Also, its entire possible a shift can happen, Vidya is full of stories of tumbling giants. PS2 to PS3, Xb360 to XBONE, Wii to WiiU.