It requires more than that
https://xenforo.com/community/threads/3k-blocked-due-to-other-4xx-issue-in-google-search-console.224863/
The problem was discovered and a solution was found a year ago. That's why I'm surprised it's not fixed yet.
I thought browsers support lazyloading by default these days. And cloudflare addon just allows to do things in acp without the need to go to cloudflare, but doesn't give any extra advantages.
While checking my forum with pagespeed insights I noticed that it gets "checking if you are a human" page. I didn't change anything on cloudflare for years. What's going on? I'm afraid that google will drop all pages from it's index because of that.