So much this. Its a lie plain and simple.
Oh, so you like honesty, eh?
Let's see, hmm... Jim Ryan said: "it is time to give the PlayStation community something new, something different, that can really only be enjoyed on PS5."
I guess that means that it would be impossible to run Spiderman: MM on PS4 even though is using the exact same engine as the previous entry. I mean, maybe they are ADDING so much more details to this one that it would be just impossible to turn off said details to make it run on PS4.
Oh! and I can totally see how Sackboy would be just impossible to run on PS4 as well.
Oh! and btw, I guess we can totally see how the X1 is holding back the development for Flight Simulator.