I wonder what you would say is Sony presented PC games running on PCs at their PS5 reveal....
More importantly, MS has a product coming out in a couple of weeks and they have zero content dedicated to it, it's like selling a blueray drive in a world where all the disks are on DVD, people need to trust that the actual HD (4K) content is coming... MS doesn't have the track record in providing outstanding content.
It matters, showing off the new product is all that matters when you are releasing it.
Sony stated that the content ran on PS5, if you choose to not believe it I don't know why you doubt it, nothing other than resentment and a desire to say "Sony too".
This is not a "conspiracy" this is an observation of reality, neither you--nor anyone--has shown what makes it a conspiracy theory. I'd say that if there is a conspiracy theory to be had it would be when people just believe that games that show off the power of this new console, in one way or another, exist... I mean, why would they hide them? They want to sell this machine so that people get on the gamepass train.