It does happen, yes, but it's also extremely rare. They even state that themselves, roughly 1 in 10000 vac bans are usually a faulty ban by an automated system. If you are that one person you can complain and get it overturned but the large majority of bans are non negotiable.
There could be a programme that's flagged falsely or something, though?
I mean so many people are getting banned an unbanned that it cannot be pure coincidence. I would still agree with you that most have cheated, though.