I'm glad the author of the post recognized that it is possible to switch from being a night owl to an early riser. Anecdotally, I am a night owl... if it were not for work and kids, I would sleep late and wake early. That feels natural for me.
But, when my daughter was born, I was forced to switch and it has been fairly painless. If you're a night owl, it's worthwhile to at least experiment with waking early for a period of time to experience the productivity increase that occurs from waking early.
I find that on a night owl schedule, my creative side was heightened, whereas waking early allowed me more energy to "get things done".