... it [the government] decided that the problem was that readily available methyl (industrial) alcohol — itself a poison — didn't taste nasty enough.
The article got it right:
Industrial alcohol is basically grain alcohol [ethyl alcohol] with some unpleasant chemicals mixed in to render it undrinkable.
It's not as if you would ever need to denature methanol. Denatured alcohol is typically ethanol with 10% methanol (a toxin) added. Such a formulation is also called methylated spirits.
I find it amusing that one of the antidotes used to treat methanol poisoning is ethanol.