That doesn't really say much Lokk. All it says is we can link our GW1 account to our GW2 account. It doesn't say anything in there on how we will be able to do it. We still have no information on how we will be able to link our accounts. So we are unsure if we need a NCSoft Account yet.
What I suggest OP, is to contact NCSoft about it. If you have an NCSoft Account, they will help you with recovering your information so you can link it to your GW1 account.