It was true years ago. See The dim and distant history of Global Warming on Wiki: the GW wars. But that was more than a decade ago. Since then the denialists on wiki are a spent force; indeed, there aren't really any denialists; we have more trouble with enthusiastic but not quite competent people trying to improve things like the Greenhouse effect. Or, jut, articles that no-one gets round to fixing. For myself, I haven't touched the Global Warming article since the clowns decided to rename it Climate Change. Instead, what seems to have happened is that the true nutters - the WUWT type folk - have instead in their own minds innoculated themselves (how ironic) against wiki, and decided that they don't care what it says.
Nowadays we get nutters one at a time, who make a few perfunctory edits, get reverted, and are never heard from again.
I probably sound bitter and twisted, because they didn't interview me. Well I am bitter and twisted, of course, but not because of that. I corresponded with the nice MS, but preferred not to be interviewed; although that may have been a different project.
* The Good Group by Bryan Caplan