This is a categorically false premise. The kind of statement that only makes sense when you're in a deep bubble and entirely removed from the average person's use of the internet.
Deliberately removing yourself from Google is fine for the author who is more concerned about taking an ideological stance than they are about being discoverable, but removing yourself from Google is terribly bad advice for anyone who wants to help people find their content.
Many people do use Google to find content and people, even if you don't.
I've blocked webcrawlers from my websites for years now, so you can't find them on Google (or most other search engines). But plenty of people find them anyway because my audience shares links with each other, puts links on sites that are indexed by search engines, etc.
If I were addressing a more general audience, this might not work as well.