Yeah, I agree with the true description of the move.

If you don't mind, I think this description may be a little better (although I wish I could see it in the anime; Air Slash has never been seen in the anime, am I right or wrong?)

Air Slash – FLY – The user begins to rapidly flap their wings, causing a fierce wind to speed into the opponent (think of a strong breeze from a supercharged fan, as in one that moves so fast, not even a human can fight past it). This attack can strike the targets weak points more effectively.
Fatigue: Moderate
Damage: Good
Accuracy: Excellent
Other: Special

On a side note, it's almost like a weakened Aeroblast, but I guess you could say that it would be hard to resist the strength of such a strong wind if you tried to go through it, as it would just push you back.