Of course you are right 10.5xx is R2 (and SP1 for SQL 2K8 would obviously fail 🙂 - but that wasn't the point. Needs update. As per the connect item link it should read:

"The installed SQL Server product version is 10.0.1300.13, and the expected SQL Server version is 10.0.1600.22"

Thx for pointing it out.