Binary has nothing to do with it insofar that the space is adequately described by two labels. The problem is solely that the labels are unclear, and the argument of the article is harmed by bringing binary into it.

I could just as easily extend the colored functions[1] analogy by bringing into it yellow functions that are also annoying to call and have their own incompatibilities[2], and now we have three labels, red/blue/yellow which tell me nothing at all; honestly I don't even remember which ones are red functions and which ones are blue. Of course in the case of the original article the labels are supposed to be arbitrary and don't matter, but responses to it continue to use the colors and thus attach semantic significance to them.

[1] https://journal.stuffwithstuff.com/2015/02/01/what-color-is-...