Well. we both, and all the others, just don't know if they can detect HB. But in the email blizz sent to me they claimed, that I use illegal 3rd party software. Maybe they can't and they are just bluffing. Maybe this is the reason, why you can turn the perm ban so easy to 72h. Maybe they just want to "scare" us. I just don't know. Threre is so much saying and so few knowing in this thing.
I think their detection is : "You are playing like a bot, so you are a bot"