Lol, these mhers don't even know what are they using. It's usually just dl -> install -> !gopub apem proz 1450+
Any reasonable mh would just detect -ah incoming and bypass it. This command is useless since somewhere around 6.4x/6.5x (more or less, really can't say precisely). Plus, even simplest mh would set some hotkey to toggle it on/off in-game, gray out healthbars of fogged units and have few more functions. WC3 is old, and was probably hacked in every way possible.
Only thing IceFrog could possibly implement would be live fogclick checking, shouldn't be very hard to code it but it would return fuckton of false positives. And could only serve as info for players someone might be suspicious.