If your definition of "works" is "provides nontrivial protection over the course of an 8-hour workday indoors", then yes, I would argue that does constitute a conclusion of "doesn't work".

This isn't a "disinformation tactic" any more than your argument of "it's not 0% therefore it works."

Note that I am also not arguing against mask-wearing. I am arguing against the notion that we can go back to normal in the near future, because masks don't seem to do all that much, and there isn't much else we can do.

That, or we have to accept a nonzero (but not that large) probability of getting sick with a new disease other than the usual flu, colds, etc., and hope that for the most part the vaccine-breakthrough infections aren't serious or life-threatening.