Well, from the looks of that vid, he has had other saws. His technique and ability just is not that good. He may as well have a 290, it would not be any different. I think that I do not want to be anywhere near them, though I am sure there are many of him around here.
My girlfriend and I go out and we can cut a 3/4 cord in the large bed 3/4 ton Ford in about 2 hours now. That is out and back, and stacked at the house. Mix of madrone, Doug fir and maple. We are not experts, but I carry extra chains, extra saws and I at least wear a minimum of: gloves, ear plugs, and glasses, and chaps and a hard hat if I am doing any felling. With razor sharp chains the cutting is the fast part. Loading it into and out of the PU is the harder task.
Dunno... I have to give neg rep points (is this guy on AS???) for people that do not know what they are doing, admit that they are not doing it right, really suck at what they are doing in spades, and then post a video about it for others to immitate. I want to see the video of him mixing gas... and what he uses for bar oil.