Look at the way that axe is held and used and you can tell a lot about both it, and the man using it. He's been practicing a while
He knows exactly where that edge is without even looking at it. Over years of use (practice) the axe has become an extension of his arm. He could probably brush flies from his nose with it and not break the skin. (see the way he glances up at the camera/audience without stopping work)
By the way the axe is used you can see that it has a very fine edge. Not just sharp, but fine (thin) too. It woud probably be an awful tool for a great deal of bushcrafting applications, but it's a mean carver alright. Holding the axe the way this guy does, right up the handle at the back of the head (choking up) means he's using it more like a heavy knife than a traditional axe, and the tool has the edge of a knife on it rather than a practcal axe edge.
It's a very nice video though