That's not all of the truth :).
The M-2000C is a 80s bird that we have is a 80s bird, the radar, systems and weapons are from the 80s.
But the aircraft that is implemented in DCS includes the improvements that have been made to the aircraft up to the years 2000s, like the NVG compatible cockpit, the ECM panel, the NVGs...
So if you make abstraction of those small differences, yes, it's a cold war bird.