Thanks so much for the research!

These errors have already been corrected as a result of a series of planned changes. The mechanism of operation of the hybrid PoS / PoW system we are discussing inside the development team constantly trying to improve it.
We always glad to collaborate with researchers and improve the Emercoin as an open source product.

Here is a similar study that you might also be interested in:
https://medium.com/@dsl_uiuc/fake-stake-attacks-on-chain-based-proof-of-stake-cryptocurrencies-b8b05723f806

PS: currently Emercoin uses hybrid Pos + Pow

Chain Length 364522 Blocks
PoW: hashrate sha256 merged minied with BTC: 13 EHash (this is more than BCH-ABC / BCH-SV)