It'll probably be a wash in the end. "Loading Times" are virtually impossible to quantify in the scenarios where either console's new I/O architecture changes things.
The new consoles will do better at streaming assets -- while the game is actually running and you're actively doing stuff in it. Non-interactive load screens are probably going to be just as slow, probably even slower on the PS5 since it'll be clock throttling during load screens.
Yeah you have no idea about what you are talking about.