Some of these games may also be available on the PS Plus Extra/Premium tiers if you can't access a PS5 in time to claim them, but there's no guarantee they won't be removed in the future.
If you want to carry on playing these games after that date, you'll need to buy them or hope they get re-added.
The big one is the removal of Marvel's Spider-Man, which is a Sony first-party title and therefore the kind of game you'd expect to stay on their subscription service in perpetuity. Related: PS Plus Extra/Premium free games for April 2023