I'll agree with you on this, but what I don't understand is why would being an introvert disqualify 10 points from schizotypy? It shouldn't be deducted just because their personality makes them more schizotypal. Plus taking out 10 points seems highly arbitrary anyways.
So I assume that you follow the same standard for the schizotypal test by subtracting exxp traits for ADHD and subtracting inxx traits for schizotypal? If you're going to subtract points for introversion, you might as well subtract points for intuition, while you're at it.