Every neuro psych will have biases. His comments on premorbid conditions are weak. There are only a few tests that can estimate premorbid functions, and only in limited areas. They have to rely on other data like interviews with the subjects and family, etc. to arrive at opinions.

Why does pre-morbid vs post-morbid matter ?

"For instance, my tests showed up major discrepancies between premorbid functioning/academic performance levels and neuropsych results."
What were the discrepancies ?

What were your scales in visual perceptual reasoning, executive function, working memory and visual memory?