What makes you say that?
Because their admin threatened to DDoS us unless we gave him adspace... And that same email he used is the email listed under muffin's account on Avoyel. I definitely wouldn't put it past him or his group that they're behind the attacks. Also considering that their site name is posted in every one of their spam posts... I'm about 99% sure it's them.
Keep in mind, though, the same kidiots who have been stealing usernames and posting CP here could be setting the other site and its admins up. It's not hard at all to spoof any e-mail address to make it look like the message was sent from that e-mail address. Plus, it doesn't really make sense for Avoyel staff to "sign off" on posted child pornography. That is more like something the Zoklet kidiots would do to try and frame the other site and staff, just like they're trying to kill your webspace here.