I am batting 1.000 getting people off of insulin in my family. But sure, he's a quack. Whatever.
I have just the opposite experience. In the late 80’s Wallach tied in with a MLM guy in Santa Cruz where I lived at the time. The MLM guy sold us on the program along with a large number of others. We all went all in. After about six months the MLM guy stroked out and one of the other committed people had a serious heart attack at the ripe old age of 32. I stopped the mineral goo and went what is now called keto diet and improved my medical situation with that. Glad you had results that were positive but Wallach fits the classic definition of a quack.
https://rationalwiki.org/wiki/Joel_D._Wallach