From my experience, despite all the citogenesis described in other comments here, Wikipedia citations are still better vetted than in many, many scientific papers, let alone regular journalism :/ I recall spending days following citation links in already well-cited papers to basically debunk basic statements in the field.
I do not have notes from that time anymore, sorry. I do recall though that after following a chain of citations I ended up at the paper in the center of this controversy. Nobody sane would cite in now except to point out its flaws, but if there’s a modern paper that cites a 10 year old paper that cites a 30 year old paper that cites it—people usually won’t notice.