Well, you can be Forced into a No Postcount group, but that is different than the one he is signed up for. There are literally two User Groups.

1. No Postcount (Voluntary)
2. No Postcount (Forced)

1. is what Death is in, while 2. is more of a punishment for spammers and such. Either way, you can't be "forced" into 1., since you can just as easily take it off.