The sole reasoning behind this is to simply use cheaper, thin stock instead of:
A) using thicker, more expensive stock that might give you a functional poll (if you're a knife maker that just cuts and grinds from stock)
B) actually forging a proper axe
So yeah - aside from lack of skill and cost savings I see zero reason as to why this would be a practical idea. All the talk about weight savings is total rubbish: outside of self-defense applications, weight and a certain degree of bit thickness is a necessity for an axe to do its job. As trigga already stated, if you're keeping it ultralight, you're better off with a large knife.
That said, I guess props to the guy if he can manage to sell some of these. The materials would cost next to nothing and the level and skill and time invested compared to forging is laughable.