I checked codebase of this coin and found that dev removed check for LAST_POW_BLOCK. It means that this coin still accept PoW blocks. Why it is important?
1) First of all, this coin has risk of double spends(anybody can create chain fork with desired length)
2) Coin uses shared difficulty_retarget and if anybody rent 10Gh(for instance) for 5 minutes to create PoW blocks not only PoW difficulty rises to infinity, but PoS difficulty too and blockchain will be stopped.