Does this notice mean anything?

This is nothing new. This is just an updated version of the old message. This popup means that your account had too many failed login attempts and Nexon put a verification flag on it. This message means that someone gave a good effort to hack your account. I am sure there is some crossup with it, though, if you are still able to use all the features

I can't say that you are wrong, but I do find it a tad odd that me and the rest of the people got this right after the Phantom update. I have never heard of it before. I also doubt that it is an update of the old message because of how it is formulated.