Author says don't focus on the morning being your peak time, you should find the time of the day that is the peak time for yourself. Ignore the fact that their good breakfast and work out helps power their peak times. Inconsequential.
Okay, but that's why those morning routines have you do the rote/everyday stuff quickly in a short window, so you can have longer peak times during the day. Notice in their long list of things blogger says you should do is none of the real work you get paid to do.
Granted, you don't have to wake up at 6am; but if you're going to have a routine that you do every day, that you should optimize such that it doesn't get interrupted by work messages and e-mails or other responsibilities, when's it going to be?
It's going to be early in the morning.
The author is making the exact point they're attempting to refute. You should have a morning routine, it should be filled with things that are good for you and harder to schedule during the day, you should optimize the specifics to what makes you feel good, and doing it will make you more productive as a result. Great.
I'm glad the author took the time out of their day to correct all those other incorrect bloggers who didn't know what they were talking about.