No, you dont understand. That is the purpose of the "pubky core". It's essentially looking up IPs with an npub. If you want to run a "homeserver," which supposedly is the entire purpose of pubky, you post your IP alongside your npub and this is published so people can connect to your homeserver. It's literally the dumbest idea I've ever heard of. Why not just enter the person's IP address directly? Well, I suppose you get the user's public key as a result that can be used to open an ssl connection, but that is not how it's being pushed. I doubt he has a solution to multiple pubkeys being published for the same IP, but if he does, kudos - he solved a problem for a solution nobody needs. It's claimed to be "better than nostr" but it provides zero anonymity, and it solves none of the problems that nostr does.
The guy is just an attention whore trying to get people to dox themselves with his retarded software.