This reminds me of when SB gave them universe Level durability off an attack name because it had big bang in itI believe Joker is strong. But I just don’t think the arguments for giving him Causality Manipulation resistance are strong enough.
All the feats I see for his resistances are some form of reality warping or time hax. Which are notable. But they aren’t the same as Causality Manipulation that can neg a fated event (when Diavolo saw himself killing Giorno through Epitaph), and neg a time hax that erases time across the universe.