They only mention Diablo because of the randomisation aspect, which regardless of this rumour, the game desperately needs. I enjoyed Spider-Man but finishing up those final crimes around the map was dull as dishwater, you just did the exact same crimes over and over and over. Switching those up isn't a bad thing.
I'm calling BS on that. You can create ambitious PC games and bring those to consoles with compromises, same can be said of Spider-man, it can be made from the ground up on PS5, then ported to PS4 with compromises, unless the publisher is greedy and/or lazy. Stunt to force you to buy a PS5, I can guarantee based on years of experience with purchasing new consoles, this game will NOT hold a candle to later PS5 games, so what's the point?