The forum appears to have no moderators; only the administrators Joseph and Kornel. Kornel hasn't logged in in months. Joseph was here two days ago -- and he apparently did delete a lot of spam posts then. But the spammers just made more.
It is important that the posts be eliminated as soon as possible. The spammers aren't trying to advertise to us, but to boost their search engine rank. The longer their posts remain visible, the more likely they are to benefit.
If you look at the spam posts themselves, they contain links into other spamposts on other forums, presumably victims same as us. This is probably part of the effort to fool Google into thinking the spamposts are "real" website content.