I am not making this claim, the article is based on a number of studies measuring different types of intelligence. It actually does say that they are all almos

I am not making this claim, the article is based on a number of studies measuring different types of intelligence. It actually does say that they are all almost exactly the same (sure, highly intelligent individuals will score better on one set of problems than on another, but they will score highly on most of them; similar for average or lower intelligence folks — their scores on each of them correlate but are not in a strict linear relationship). That suggests that they are ultimately one and the same (as per those studies).