The author seems to have a single-mindedness about optimizing their own performance. If performance in terms of your value to the business was about sitting down at a computer and coding, getting in a "flow" state, etc, I would agree. Problem is, personal efficiency doesn't necessarily align with value generated. I've seen engineers spend months regularly obtaining "flow" with few interruptions or meetings, only to have the projects scrapped because they weren't what the business needed. The fact that the code was immaculate didn't end up mattering at all.
Informal, personal communication can make a big difference. Yes, getting up and talking to someone is more efficient than starting an email thread or slack conversation in many cases. Many of those conversations are engineer to engineer and involve important technical decisions.
And, an aside: remote meetings are simply worse than in-person meetings. Having worked on several teams where some members were in completely different locations (and time zones), I never want to experience that again. Give me every person relevant to my work in the same physical space; I don't want to get blocked from doing my work because you've gone dark on slack.
I promise, I get it. If I had my way, I'd work on whatever I wanted to work on, with no meetings or interruptions. I'd just be a lone wolf cranking out awesome features and feeling great about it. That's just not what any business needs, and it's certainly not what they pay me for.