I’m sure - astronauts are probably a pretty dim group. Probably because they’re typically chosen from pilots who are probably well below the average.
The only pilot I have ever read about being below average was John McCain, almost at the bottom of his class at the Naval Academy, and crashed several planes before he got to Viet nam.
The rest are usually the pick of the litter, maybe that space oxygen and being too close to the sun destroyed their brains.