Seems the guy in the second video had better results,
but that could be for lots of reasons, my first instinct was the chain needed sharpening,
which goes without saying really.
Still looks a bit variable even with, but the most notable being the long bar being used in this technique.
I'll have to look at Advoko's videos again, but it seemed like he had a shorter bar...
which may well be the reasoning for the emphasised swinging, compared to letting a longer bar sink down from the front whilst
cutting fore and aft with more teeth in the cut.

Plus one small example of why one might want chainsaw rated gear, wouldn't be fond of getting a chain to the face.
Cheers
Tom