Such a straw man article. He ignores the main argument against WFH which is that people are walking their dogs or doing yoga instead of actually working. I take long naps. I know I'm less productive but I can't help it.
Coffee breaks, social media, reading HN, which in WfH means walking the dog, spending a few minutes with your family, doing some yoga stands after a meeting.
And that is perfectly fine. Unless you're very focused and enjoying a particular task, no unassisted human being is capable of being 100% productive 8 hours a day, 40 hours a week. I might be an outlier, but in my experience, max focus can be held for up to 4 hours a day, the rest is low focus work and faffing about.
I've been doing full remote for six years now and it's wonderful, especially when you have good asynchronous workflows in your team to rid of "working hours" concept entirely. (Though possibility of that heavily depends on the role and team composition).