I'm truly wondering where on this forum you've seen this. Sure some people (like me) have said the XSX will be more powerful, but that's nothing compared to the amount of people that hyped the SSD through the roof ever since the UE5 demo. I've seen this a couple of times, that Sony fans have this weird perception on what is happening as if they are in the minority, and most posts aren't mostly positive about the PS5.
There is definitely a significant proportion of xbox fans who believe it is a stone cold fact that SX is significantly superior to PS5 and furthermore are obviously invested in this "truth". There are a few on here and Reset Era - I don't want to name names and get into some bun fight. But on twitter there are loads.
In contrast PS5 fans believe the SSD will make up the difference to some degree, but they are not - IMO - invested in superiority.
While I think SX is likely to be an overall more powerful games console, I don't think it's a fact - because it's not a fact - the differential is small enough that it can be countered by a more efficient architecture, and the PS5 potentially could deliver on that - but if I had to bet money I'd say it won't, might change my mind after tomorrow mind