I concluded from that, distillation cannot be used to concentrate alcohol. I'm on chemist, but I know enough to know that your article fails the sniff test - it is taking some facts but it is misapplying them.
If that's the conclusion you drew from that article, you either didn't read large sections of it or failed to understand it. Not sure how to help you but to suggest you try again.
The principle is the same reason why when you distill at 180 degrees, you do not wind up with a distillate with zero water in it.
Sure you don't get zero water at 180 degrees - but you get less water which is why we can distill alcohol at all to remove water. Likewise you get more methanol in the early stages - that doesn't mean you get it all in the early stages, but you will get an elevated amount.
Exactly, now you've got it! The last caveat is that while methanol is slightly elevated in the heads, it's not meaningfully so. It's present throughout the run at nearly the same concentration. There just isn't enough methanol in a home brew to produce a meaningful early spike. And you certainly do not discard all or even a majority of the methanol if you toss the heads.
And this is why home brewing and distillation cannot cause methanol poisoning.
