Perhaps one needs to consider different styles. I've always considered an auger with 2 handles and the motor on top to be a 2-man auger. At least the big ones from rental companies. Perhaps the HF auger is a lot smaller (they say it can be operated by one person). The big rental 2 man augers are a beast to work with to make a lot of holes.
What I've heard called one-man augers were like a little lawn mower with the motor sitting on it and a torque bar to the power head and auger. They are much more pleasant to work with.
However, those commercial duty one-man augers are a little bit on the expensive side.