It is evidence, which is necessary to my argument that creationism is wrong and evolution is right (and evidence is far more than anything posited by the creationist side). It seems odd that, when I point out how terribly flawed creationism is, and then give evidence to back up my contention, I'm suddenly not making an argument by your definition.
As for the folks who report these sites to be flawed, most creationists have a very limited and flawed understanding of science (as do most Americans, from the latest studies that have recently been published). When it comes to evolutionary biology, I will trust a biologist over Pastor Bob any day.