Accessibility wasn’t the main topic discussed in the article
That's part of the problem. All these rants about the glory of Web 1.0 are ignoring the fact that Web 1.0 wasn't usable for anybody with accessibility issues and the modern web is better for them. A tiny acknowledgement at the bottom of their rant shows how they value accessibility lower than all of their other concerns.
Accessibility almost always refers to disabled people, especially in web development. I've never heard anyone in the industry refer to accessibility in any other way, without explicitly making that clear.
If they meant the reading you took from it, that's even worse and my point is even more pertinent.