Right, but you kind of took that quote of out context...
I did say that for a hobby welder that it would probably be fine. I also stated that welding in 20 second bursts and resting, that rest time counts. Welding technique does not change the duty cycle, as you state, however, your welding technique change your productivity rate with the same duty cycle welder. I think it would be safe to assume that since he bought this welder that he is a beginner and wants to learn to weld... probably not going to be trying to fabricate a heavy duty bumper soon.

It will be a good welder to learn on and like I said, while he's learning, he can be putting money in the bank to buy a bigger unit after he's gotten the hang of it.

BTW, I keep hearing everyone talk about proper gauge wiring when welding and using extension cords and how big they need to be... (previous welding thread)...

The welder he bough draws 15amps @ 230volts input.
That's only 7.5 amps on each leg of the 120volt at full load.
A 12 gauge extension cord would handle that just fine up to 25ft or so.

I have a Millermatic 175 that draws 19.5 amps at full load.
That's less than 10 amps per leg. That could easily be run on a standard 15amp set of breaker and run on 12 gauge extension cord. I had to change the plug on my welder. When I cut the wire, the wire on the stock cord from Miller was only a 14 gauge wire. Granted, the farther you run the extension, the heavier wire you'll need, but a 12 guage wire would be more than enough for at least up to 25ft if not more.