False Positive : Hotfix 2889748 prevents Windows Management Instrument usage from memory leaks on your Windows Server
Getting this Alert flagging up on machines running Microsoft Windows Server 2012 Standard, but the linked KB article only applies to Windows 7 SP1, Windows Server 2008 R2 SP1, or Windows Server 2008 SP2. Guessing that it's incorrectly picking them up for Windows Server 2012 Standard (and probably Datacenter too).
Yes this is a false positive due to broken OS detection logic, as you suspect.
The hotfix has just been released today (Aug 21).
you should get the latest MPs within 12 hours.