No that's incorrect.
We are running a brand new clean install of the latest release SEP 12.1.2 (aka RU2) and when you go to Monitors and generate the 'Computer Status' report, it reports Windows Server 2008 R2 machines as Windows Server 2008. And yet on the initial RTM release of 12.1 this used to correctly report the OS. So did the RU1 release. Which mean it's been broken in RU2.
Also, go to Reports, and generate a Computer Status->Client Inventory report, and 2008 R2 machines appear as regular 2008. And yet like above, in the RTM release and the RU1 release it did report it as 2008 R2. So again, more broken functionality in RU2.
Go to Clients, right-click a 2008 R2 machine and select Edit Properties, and look at the OS field. it too incorrectly reports it as Windows Server 2008. This defect has been in SEP 12.1 from the RTM release, and has never been fixed.
So in summary, this defect has become worse than before with the most latest release. Surprised no one else has identified this. While to many it may not seem critical, in large enterprises customers want accurate details of their fleet, especially for reports to management.