Hunter pvp exploit (good for RBG)

I just found this video from youtube. There are 3 exploit?

1. Hunter can disengage up the edges in strand of ancients all the way last gate and destroy it with bombs which will mean 100% win.
2. Hunter can disengage top of the waterpipe in twin peaks. No other class can get there it is safe spot.
3.  Hunter can disengage up top of the LM building in arathi basin which is very good rbg.

It sayes the hunter is 2940 rating in RBG in description. The hunter exploit to get high rating?