Netlify is an awesome service, but we found it necessary to switch back to GitHub Pages for our play-project.org. We deactivated the build flow and deleted it, and then changed DNS records at Name.com according to the GitHub Pages instructions.
It does resolve. Without SSL. It redirects to the apex domain.
This is what I see
$ dig www.play-project.org
www.play-project.org. 377 IN CNAME play-project.org.
play-project.org. 377 IN A 185.199.108.153
play-project.org. 377 IN A 185.199.109.153
play-project.org. 377 IN A 185.199.110.153
play-project.org. 377 IN A 185.199.111.153
For example, if you want to use the subdomain www.example.com for your user site, create a CNAME record that points www.example.com to <user>.github.io.
You have not done this as shown by the output above.