Even without Cloudflare, simple NGINX microcaching would help a ton there.
It’s a blog, it doesn’t need to regenerate a new page every single time for anonymous users. There’s no reason it shouldn’t be able to sustain 20k requests per second on a single server. Even a one second cache on the backend for anonymous users would help a ton there.
They have Cloudflare in front, the site should be up with the server being turned off entirely.