As for the hyphen errors, they are common for people for whom English is their second language. I commit hyphen errors similar to what is described all the time because English hyphenation makes absolutely no sense. In fact, reading the list of examples, the mistakes listed makes more sense to me than the correct way of writing those.
I also switch back and forth on a lot of the phrases the article mentions.
I also switch back and forth between US and UK spelling, because I learned UK spelling at school, but was far more exposed to US spelling in practice.
This seems to me to be exceedingly weak.
I'm not sure I agree with that, but it's what I came up with after challenging myself to read the article in toto again and note 1 by 1.
It's clear it's beyond a couple tics everyone has, and when you combine that with the starting set being ~500 instead of "all 8 billion people on earth", well, it's worth mentioning.
In terms of language, I don't agree it's beyond a couple of tics everyone has at all. I also don't agree with the assumption that the starting set is ~500.
It's of course possible that it is Adam Back, but I don't find the purported evidence remotely compelling as a way of showing that it is.