Interesting. I just scrolled through the essay but haven't read it all yet. After reading Walker's book, I did sleep much better. I noticed that Walker does not always cite studies, like the ones he himself did. My approach to the book was to just view it generally. His main idea was sleep is more important to our health than we realize, and a large amount of people aren't valuing it. I definitely think smart phones have hurt people's sleep.
The book made me take sleep more seriously, and improved my sleep hygiene, and I have slept a lot better since reading it a year ago. With that said, I didn't trust everything he said. The one area I was trusting in was when he talked about sleep, cancer, Alzheimer, and learning. I believed his findings in those areas so maybe I've been led astray.
In an interview I recall him saying he was a vegan for health reasons. I found that odd considering how obsessed he is with the health benefits of sleep. I thought that was a red flag, but because I've slept so much better since reading his book I ignored it.
I think the main thing that has helped me sleep better is going to bed at the same time and waking up at the same time, even on weekends and vacations. So I'll continue doing that. But if the book is largely mumbo-jumbo then I'll have to forget the other things I learned in it.