The website seems to be returning a lot of PHP errors when I search for an address.
E.g:
Notice: Undefined index: 1dice8EMZmqKvrGE4Qc9bUFf9PX3xaYDp in /home/bitcoina/allprivatekeys.com/explorer.php on line 323
I don't know about a service that ties addresses to Bitcointalk accounts, but there's a service similar to OP's.
https://bitcoinwhoswho.com/This service also shows you on which websites an address has appeared.
You can also just Google:
site:bitcointalk.org ADDRESS_HERE
It will show up every place the address was mentioned in the forum.