This self-perception disorder might, on the other hand, have positive effects on one's commitment to success. The person with the balanced life might be more creative and reliable, but be less willing to make sacrifices.
For an executive of a company, creativity and reliability will matter more than the willingness to make heroic sacrifices. For an entrepreneur, I am not so sure.
I guess I count as a multiple entrepreneur at this point, and I'm absolutely sure: starting your own business does not make you superhuman any more than anyone else, and trying to put in a silly number of hours over an extended period will still make your work rubbish just like everyone else.
I would not be surprised if the entrepreneurial mindset exaggerated the effect mentioned in the article where people who put in crazy hours feel very productive as a result, though. Perhaps that's one of the differences from just being a geek working for someone else: if it's your business, you are not only the geek who thinks he's being super-productive by working too hard, you're also the manager who has to tell the geek to stop being foolish.