The available summary of the preliminary injunction doesn't mention the messages themselves, but it does state that the plaintiff is being accused of (sexually) transgressive behaviour by the posts they want to see removed.

It's possible that this is just some abusive asshole using the court to clear their name. It's equally possible that the accusations are all made up and that the person who posted them has a grudge against the plaintiff for rejecting them. We have no real indication either way, other than that the judge believed that there is a chance the plaintiff is in the right.

Either way, I think it's fair to assume something went wrong during a date. I'm not sure what the rest of the parent post is referring to.

There does not have to have been a date though. The story could have been made up by someone who just saw his profile on some dating site and did some creative writing based on that.