The fact that almost every single link on the page goes to a 404, times out, or says Forbidden, might have something to do with it.
Or the gigantic, seemingly meaningless URL.
I don't know what this page is, but it doesn't seem to exist in any kind of context of a larger website. How did anybody even find this in the first place?
"Accessible," like so many words, means different things to different people.
You're saying this page seems inaccessible: how did anyone find this page? How is a person meant to access this stranded corner of the web?
They're saying this page has good accessibility: those with impaired vision, who use text to speech tools and the like, would not face difficulty with this simple HTML.