This guy's just a massive Frasier fan, likes to point out his physical disadvantages without explalaining that styles make fighters, and styles are often determined by physique and stature. Being 6' 3" wouldn't have the slightest advantage for you if you were using frasier's particularstyle of fighting and ducking under the jab.
Ali was certainly not at is elusive best after his comeback, Bonavena wouldn't have layed a single glove on him four years earlier. That being said he was still very very good and was very capable of adapting to any situation, so we shouldn't take anything away from Frasier for an excellent performance and win.

The main thing in this article that proves the guy is not thinking impartially is the way he bring's into the equation Ali's losses to Berbick and Spinks to prove that Frasier was better. Nothing needs to be said about the merit of that statement.