Articles like these are kind of hard to parse because there's no well-defined meaning to the title of "CTO". Our "CTO" codes, probably more than anybody in the company, but that's because he's got a founder-inherited CTO title that mostly just means "he can do whatever he wants" --- we're happy with that, what he wants is practically always great. That's one definition of a CTO. Another CTO type is the opposite: "the…
He calls himself a CTO, and that's fine, but he's really just a technical cofounder, and that's what he's acting like (and it sounds like it's a very positive thing for the company).
The CTO title and the whole point of the article are not really relevant, this entire situation would not be possible if he weren't a co-founder.
I think it is a good lesson that founders shouldn't necessarily be pigeon holed into roles they don't want, but the CTO title really has nothing to do with it.