No test measures intelligence. A test only measures you relative to the persons that wrote the test. – loosely quoting Asimov.
2007 is ancient history now. It is an interesting graph that one might correlate with a lack of meritocratic structure in society, but I’m on the low end cause I say this without looking up and reading the study. Pretty pictures evoke emotional blabbering bias and all that.
Just a random image I saved from a 4 chan thread of interesting stuff. Sorry friend. Your search is as good as mine. Single author is already a bad sign, as if 4 chan image and no doi were not cataclysmic red flags enough. It doesn’t look malevolent IMO, but solid shitpost territory.