Even if that were true, and I doubt it is, what would they be able to do with your password for Radio Reference?
It's almost a certainty that the information gained via the security breach has been distributed - it's valuable. They would be able to use personal information from RR accounts to associate with other websites, and attempt to gain access. Unfortunately, many people use the same password and user name across multiple websites. This incident should not be treated lightly because "it's just RadioReference."