Some thing very wrong with that article, hundreds of Chinese Water Deer (the Deer in the photo) in England & survive else where I'm sure, so maybe a subspecies but Chevrotain is a type of Mouse Deer & quite a few in Asia so I think a subspecies of Mouse Deer not Water Deer.

Ill have a look for a pic of a Chevrotain !

Chinese Water Deer are a Pest Deer in England & I was hoping one day to hunt one & a Muntjac (also has fangs) over there, I hunted in Indonesia a long way back & picked up (not shot) a monster Muntjac like top 5 or more Rowland Ward !

Chinese Water Deer or CWD

Both CWD & Muntjac

So looks like the same Deer all over Aisa to me ?

This is normal Chevrotain

This is one from Thailand

Indian Spotted

This is the type they "rediscovered" no doubt will be eaten soon !