I just looked at his stats. His HR trend in his early to late 30s looks refreshingly real. I don't know if he used the 'roids at all (he may well have). Does he have anything swirling around him on that topic?
To me, Thome certainly looks like he's slimmed down since MLB came down with the 'roid hammer, but that's pure speculation on my part and I ain't gonna accuse a guy with zero proof.