For Github, yes. For anything else, you would have to use their rancher tool and Cloudflare KV store. I imagine they have plans to support other providers, but aren't quite there yet.
Seems like a great way to go, and if they implemented a Netlify CMS-like feature as well, that would really put it over the top as a unified one-stop shop for DNS/CDN/static site hosting + authoring built-in, and it also has Workers for any functions/dynamic pieces that might be needed.. all on Cloudflare's metal/edge. Sounds almost too good to be true..
Some people aren't fans of the built-in protection and feel it's a bit overzealous in throwing up catpchas to certain visitors. No CMS feature. I do like it quite a lot.
