Dear Debasis,
I checked the link that you have posted. There is one comment in that link by some person saying that Muntjac eats carrion. There is no proof given. We need some documented evidences, else it would be like propagating some myths which hunters of previous era propagated. I couldn't find any research article regarding Muntjac eating flesh/carrion. Its stomach structure doesn't lead us to believe it will eat flesh. So if it is true, then I am sure soon documentary proof will be found given the large number of amateur photographers infested forests.

Cheers,
Sabyasachi