He uses his rep to hawk overpriced supplements

It's pretty easy to check his Wikipedia and see for your self what his academic background is. You can also read research done specifically by him, if you can find it, and you can read his books and judge for yourself if what he is selling is suspiciously without evidence. Or go to his website hocking "host defense" mushroom capsules.

Compared to an actual mycologist like Gary Lincoff (rip), I think you'll see the contrast to be sharp.

Or don't. No skin off my back.