Probably is = more likely than not
Reporting people that look like a duck, swim like a duck and quack like a duck, so Blizzard can confirm if they’re actually a duck.
Facts like…
- The account has been played for an average of 21.5+ hours a day
- The account has been played that way for weeks / months / years
Reporting them isn’t diagnosing them as a cheater, it’s reporting them because they have exactly the sort of symptoms that a cheater would have, and asking someone to carry out a diagnosis.