why are you saying pr0n instead of porn? lol

Maybe he's typing on a work computer and he doesn't want to trigger some kind of nsfw censoring system. Or he's a prude.

Tiktok and other social media sites allegedly derank posts with controversial words (suicide, porn, murder) so people butcher the words to talk about things without triggering the debooster. There isn't really evidence that this helps or hurts post discovery, so people mostly do it out of an abundance of caution, which is what seems to have happened here.

True but I feel I should mention that the term pr0n specifically is much older than TikTok and modern social media censorship, more of a "leet speak" slang than a tool to avoid censors.

Nowadays the youth call it corn or p*rn or just (insert corn emoji here).