Funny thing about intelligence, there are many different kinds of intelligence. This study was about particular types. It is possible that 90% of people truly are above average in SOME sort of intelligence. What are you good at? Are you smart enough to compensate for not having perfect math skills?
PLUS if you don’t use it you lose it. I was very good in algebra but not geometry. Lost it all over the decades except for accounting. Business math, good. Engineering, bad. Not creative, either. I can replicate and am mechanically inclined but not an ounce of creativity.
I am an artist and the older I get, the better I get. I am 74, I have been drawing and painting for 30 years. I hope I have 30 more years to improve my technique even more. What little math I did learn is rapidly going away. Oh well, I have a calculator . :)