I suppose it comes down to the definition of “cheat”; as I recall, the consensus was that it was an unfair advantage because it made use of a one-way texture that allowed the CT’s to see the T’s, but not vice versa (let me know if I’m wrong on this, it’s been a while). Granted, it’s using stuff within the game, but is kind of not in keeping with the spirit of a pro match.

Tournament rules considering exploits cheating. The olofboost allowed you to clip and see through some geometry you aren’t supposed to be able to.