Article says: "At least on macOS, the size of apps & notifications is not adjustable. Toolbar symbols, Tab-bar in Chrome, native apps on MacOS are not scalable."

This is factually incorrect.

By not explaining that what scaling options were tried in the article, it strongly appears that the author did not try them.

By not explaining here on HN what was tried in more detail, it appears to be handwaving away the issue.

It's totally possible that a smaller screen is better for his productivity, but that's a minor argument compared to the incorrect assertion made in the article and here.