[zmmmmm]

that doesn't bother me but what is actually suspicious is persistently only mentioning "accuracy" but not sensitivity / specificity / precision etc.

Basically, almost everybody doesn't have Alzheimers. Sampling from the general population you can get better than 94.5% accuracy just by returning negative on every test. You have to know sensitivity and specificity separately to make any informed judgement ... which they try extremely hard not to tell you.