Paul contrasts two situations, the first exemplified by the "watching TV all day" example, the second by "staying all day at the office doing busywork while not accomplishing much".
Playing MMORPGs all day seems rather like the first, not the second.
I do have to disagree with you. "busywork" makes it look like you're doing work. Often you can get away with it. You might very well be doing work but you're not really doing anything of value.
World of Warcraft can feel like work but you're not really trying to pass it off as work. If you managed to do that, who ever you work for certainly has some issues!
Playing MMORPGs all day seems rather like the first, not the second.