I’m not familiar with nostr:npub10efcj7x65z2ak6vd69xr8f2hvqwuaqrhlygl3yqa4y63hfvc02mqwzaeh3 enough, I use Albyhub, but I did write an article about vanity addresses:

nostr:naddr1qqxnzdejxucrsd3hxuurswpnqgswswmx4rkj6d7q05dtafhpkqq2z42fc62s37jvtp642m2jkpfxc2crqsqqqa28gr720v