You're correct, but you can see he already has a personal domain hosting his blog: ben.balter.com. He probably just pointed another subdomain at the pihole e.g.

You're correct, but you can see he already has a personal domain hosting his blog: ben.balter.com. He probably just pointed another subdomain at the pihole e.g. pihole.balter.com. That's what I did with my piholes and other internal web apps on my home network.