It'd be pretty shocking to find someone performing at that level who doesn't increase their testosterone levels (and much, much more) artificially. I'm pretty sure Stan is still on HRT these days. It's sort of a loophole in the system these days for how to obtain it legally. It's not nearly as powerful as cycling it, but it's better than nothing.
I always find the whole "but they take steroids" argument strange.
It's actually funny you should mention taking health advice from powerlifters, bodybuilders and strongmen. Stan Efferding has an entire video on the subject, where he makes it clear that if you want to look or perform like him or some of his peers, you will most likely not be healthy: https://www.youtube.com/watch?v=yxHZrF4AFRg . The part that struck me the most was that some of these guys need CPAP to sleep once they get into the 300-400lbs weight category, just because a human body isn't supposed to weigh that much.