So I agree in the sense that, you're always going to rely on something. Even if you're hosting on hardware you own at your house, using your own self-signed SSL certificates, you're still relying on an internet connection from some company.
But, I think using the term "fully-owned" to refer to pushing up to GitHub, then deploying to Cloudflare Pages is definitely not "fully-owned"
What I meant by "fully-owned" is really about owning the content and the workflow: everything lives locally in plain text, versioned in Git, and built with open tools. I can move it to any host without being locked into a platform or losing anything.
You're right that hosting on GitHub and Cloudflare isn't infrastructure ownership. I should’ve been more precise with the wording.