Actually, Ive met more than one person in my life who was very good at the job for which they were trained, but not very adept at original thought or logic. I would suspect that its quite common. I once new a microbiologist with a Masters degree who was dumb as a rock. I’ve known plenty of doctors who were chain smokers,drank like a fish, and threw temper tantrums.
That does not constitute the formal diagnosis you put forth.