That's not true. I think I've seen you state sentiments to this effect a few times now, and I don't understand why.
Because we don't know the details yet and have had sources claiming XSX will be just as fast in SSD speeds in the end. Maybe you're right and PS5 has a large advantage, but untill then, it's all speculation based on (limited) raw paper specs.
I just could see that MS kinda had to go with different tech to reach the same goal, because of the small memcard ssd upgrades, they dont want or can stress the drive itself, but make up for it with better compression.
I see many stating things are not possible on XSX or even PC like the tech demo, i just think that there is more to it. Don't forget that both consoles are designed around the SSD, and again, i think both had different reasons to reach the same goals (brute force vs efficiency). Also, WC has been a rather reliable source so far, they seem to be tight with Microsoft, and they claimed to know that the XSX will close the gap with it's tech versus the raw transfer rates.
It could all be lies though for marketing reasons, but that goes both ways so we will have to see. I guess MS will also show some more tech demos once we get closer and closer to actual release dates.
In the end, both are going to be amazing systems, as shown in tech demos what they are capable off.