The author kindly informs us that he is a "UI prototyper [...] tinkering with design concepts" and also that he works for a company making AI coding software. This double-whammy may somewhat explain the strong Dunning-Kruger gravitational lensing observed when viewing the article from a distance.
Is Notion a company making "AI coding software" these days?
If you want to learn more about Geoffrey I suggest browsing through https://www.geoffreylitt.com/#projects - I've been following his work for a few years, "UI prototyper" is him under-selling himself.
