I'm not seeing the problem with the article. The Cerne Abbas man, like most chalk glyphs in England, are not that old. There are some truly old geoglyphs - there's one of a running horse which is BC IIRC - but Cerne Abbas is not one of them
I would not have thought that in the era of Cromwell that there would have been “pagans” making this sort of thing. Seems that if it is properly dated as 17th century, then it was not done by pagans. Either it is older than that, or, the neo-pagans are admiring something that someone put up for reasons other than they think (ie, not part of ancient paganism).