OP didn’t put this in the title but the article is from 2016. Turns out a lot has changed in the last decade and I think it’s likely that the article should be updated on what it’s like right now.
Even sites that I manage with Cloudflare, I see the same. Even if I use relaxed mode on, If I visit the site via mobile, it can trigger the Cloudflare human validation.
Yes, every one-pager running on Vercel/Netlify sits behind Cloudflare now because no one wants to risk an insane cloud bill in case of an attack. People have become hopelessly dependent on managed cloud services.
However, to be fair, there's less captcha solving nowadays, since they introduced their one-click challenge (but that's not always the case).