You're arguing semantics. The web development community (and the engineering industry as a whole) uses the term "accessibility" to refer to making things usable by people with disabilities (and has done so for decades).
Pretending that people understand the term to mean a different thing, and then screeching at them for not doing that how you want them to is intellectually dishonest and just makes you look like an asshole.
The quality of being accessible, or of admitting approach; receptiveness
As another link posted elsewhere in here shows, it seems accessibility has turned from striving to make sites more accessible to everyone, to doing the bare minimum legally required by disability laws.
Pretending that people understand the term to mean a different thing, and then screeching at them for not doing that how you want them to is intellectually dishonest and just makes you look like an asshole.