I'd have to agree. Perhaps if the product you were using were spiked with methyltrienolone (not possible), then I could understand, and even then, it would be a stretch.
I honestly think this was a case where psychology played a role. Testicular atrophy, to the point where it's easily noticeable is the result of having LH significantly suppressed for a prolonged period of time. I'd venture a guess that the person had discovered that androgens can potentially cause testicular atrophy and then began to think atrophy had occurred. This is, as opposed to the unlikelihood that the person examined their testicles daily, taking physical measurements prior to, during and after taking androgens, without any previous knowledge of the association, and only after noticing a significant difference, then found out about the association between using androgens and testicular atrophy, is extremely low.