All data was taken from Wikipedia so take it for what's is worth, "Exclusives" means games that are only playable on that particular console and nowhere else. I know the moment a game gets ported to another console or to PC, the list is updated and taken off of it.
This is what the current "Playstation 5 Only" list looks like (October 2024):
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The list includes unreleased games like Marvel's Wolverine and timed exclusives like Spider-Man 2 and Stellar Blade (once these launch on PC the list will be updated).
That's not the overall number of games, that's just the exclusives that remain only playable on each console.
Using the same source it lists that the PS1 has 4016 games in total. (
Link ) and the Playstation 2 has 4376 (
Link ).