Never claimed otherwise. Just saying it's a fact of life that every test has false positives and false negatives. The "is this player cheating" test is no exception.
Check out this amazing episode:
https://news.ycombinator.com/item?id=26296339
Dude got so fed up with long loading times he debugged the game and not only discovered the cause but actually fixed it. Billion dollar corporation couldn't be assed to do it.
Gotta wonder if this guy wouldn't have gotten banned by the anticheat for having the audacity to hook into the game with a debugger or something. Only cheaters do that sort of thing right?