Your post is totally bullsh......t
if you fly below an HT cable you'll reduce the distance between the cable and the ground. In case of an 400kv line the allowed distance is about 4 metres.
If the cables hanging quite low p.ex. In the middle of the field you really have an arcing problem, even when the heli don't touches the ground!
I'am line cowboy since 3years and belive me, never fly below HT when the distance between cable and ground is to low!