Trolls attacking long time threads to get them shut down

So https://us.forums.blizzard.com/en/wow/t/worgen-customization-mega-thread Was locked and unlisted by Nythhries because a troll was attacking the thread. The question is why? Worgen players keep that and the Give Worgen Tails threads alive to give out feedback and now a troll rolls in and a moderator just shuts it down and hides it like the thread never existed?