i cant tell if it's a joke or not because i never saw it in the thread, only in notifications

his username is mrracingronster, and yes he was being serious (although i believe it was mainly just for attention) and has since apologized for the way he acted in a video. in either case he absolutely does not have the means to sue anyone over what has happened on speedrun.com. (he spliced runs and then did some less than stellar things in response, which is why he is still banned even though its been 8 years) here's the apology if you want to see it:

it is very evident that he suffers from some combination of mental issues and is currently struggling in life. the videos he initially made are unlisted, if you know where to look you can still find them. (or i can link them directly if youre curious, just keep in mind he's disavowed what was said in them)

@MilkyFrenchToast i see, ok thanks