The stand I take is that anything that the government does not officially declare, is not there. And I believe there are good reasons for why they do the things they do, and WHEN they do them. There are lots of things you hear when you follow the defence industry in the country, but I for one would never be so bold as to declare that we have X or Y, until & unless the Govt has chosen to do so.
When the intent to demonstrate a certain technology is present, toward whatever geopolitical end, we do so without hesitation - regardless of the consequences. Case in point, the nuclear tests, the IGMDP, the ASAT test and so on...and then there are cases where we choose to present things in a certain way, like capping the Agni-V's range ~500km short of being a true ICBM. That's also done for a geopolitical reason.
So yeah, the MaRVs are demonstrated. MIRVs are not. MIRV'd MaRVs are certainly not. That's the bottom line.
We are putting pieces of the puzzle in place in order to facilitate the testing of multiple-splashdowns i.e. the Open Sea Test Range comprising the range ship INS Dhruv & other elements. So when the MIRVs or MIRV'd MaRVs come, we'll know.
Until then, India's ballistic missile deterrence posture consists only of unitary MaRV'd warheads. End of story.