If you checked their thread properly, you would see the explanation, this is the 3rd post
We are moving the old thread to this self moderated format, on recommendation of the Bitcointalk admins.
This will allow us to deal with people that Spam, Fud, Lie and Dox on this forum.
Thank you!
So, they just opened new one, that's it. And as you can see, creator of the old announcement thread is also active in the new one.