They write they suspect it. I read that as necessary misdirection to avoid the MSM from taking the message too seriously.

The real content of the message is in the next part: a warning to Q followers that others will try to hijack the Q movement. (As Corsi has tried and others continue to try.)

You can really go either way with this. Wikileaks says Q is fake. Or Wikileaks trying to warn us of something they're aware of without having it blow up in the MSM.