Earlier quoted context omitted.
Thank you. I think I see where you're coming from. That article has some interesting phrasing which I think is causing confusion. (For me at least.) It looks like they're using 'normal' to mean 'average in the range' some of the time and 'mean population visual acuity' other times. Mostly they're using the former. So 'normal vision' or 'average eyesight' refers to the range of 20/20 eyesight and not 'mean eyesight'.…
No, the thing you are missing is that corrective lenses are a thing that exists. We're really quite good at taking someone with 20/100 vision and turning that into 20/20 or better.
I would recommend, for the sake of clarity, adding '20/20 corrected' or '20/20 rectified' to your original post. If I hear someone say, "I have 20/20 vision," my first thought is, "this person has perfect vision", not, "this person wears glasses."
I'll go back and add that clarification on my replies.
EDIT: It's too late to go back and edit my topmost comment. :(