Granted, I was not happy with that link and am also not so much with this one:

https://en.m.wikipedia.org/wiki/Ethanol_fermentation#Byprodu...

Still, there is the information inside, that not just ethanol gets produced by fermentation, but also other alcohols and the main point was, alcohol is not the same as ethanol.

Huh. I didn't expect so much methanol to be present in booze! (Methanol is incredibly toxic, but ethanol is an antitoxin, so that explains why wine doesn't kill people.)

That’s the angel’s share — the first bits of distillation you need to throw out.

Edit: I’m wrong! That’s the term for the part that evaporates during aging.

But this article explains what happens to the methanol at distillers and it’s pretty fascinating: https://www.whiskyandwisdom.com/bringing-balance-to-the-fore...