The thing is, that one was obviously made up from the start (very like a lot of threads here a while ago, and not the only one by that poster atm, imo) - after 850 posts everyone seemed to suddenly realised it, though mnhq are still indicating they "have no reason to believe, yada, yada, yada" 
It was reported very early - it's been on my TIW for over a week.
But if it had gone nasty after 100 posts, with the op possibly being in "trouble" and "needing" rl help, anyone asking questions, giving a warning to lurkers and naive posters not to get involved etc, would have been accused of being a nasty troll-hunter who should be banned from the site and would have been roundly abused.
There are many, many made up threads on here - ones that are completely fictitious. And yet when we have a "let's talk about troll-hunting" thread the same people come along and insist that Every Single Poster be believed, always. Even if believing everyone means a lot of people getting hurt.
This is the problem - even mnhq don't know who (if anyone) is telling the truth. And these days in relationships it appears very few people are.