That forum has been disabled due to lack of activity. It was still getting decent traffic-- but it was mostly questions with not many answers. It should be completely gone from the forum list actually...
I do know this - xenforo dropped the ball by not keeping the vbulletin reputation comments as a feature. The loss of the Reputation comments data when we switched to Xenforo really was the death knell for the site when it came to all the users that left. I know I missed it so much and I got way less interested in the site when that feature was gone and I run the site.