Yeah it's just the article that is inflammatory.
The study itself is indeed poorly performed, with its 32 non-random entries...
I can totally believe that there is a certain type of behavioral intelligence which either lends to obesity or is affected by obesity.
I used to be extremely obese and had/have a > genius IQ, very high GPA, etc... So, for any fuckwits trying to make that association, fuck off and die(?)