You could infer this to be true, but I doubt it.
As the game allows you to change your keys in options to use numlock.
Using a AHK to do what numlock does, may do exactly the same thing it can be considered a 3rd party add on which is not allowed:
Again you can use anything you want at your own risk, just don’t fool yourself. Just because Bliz has never taken action on THUD users doesn’t mean they won’t and what ever action they do take, they will not catch 100% of the people using the various things and the penalties will vary from previous history