The high quality, in depth research you do before you post is showing through again  


The message you posted is from the admin of Bittrex, an exchange. The attacker was CynicSOB who Nxters invited over to attack Nxt, even set him up on the testnet and let him have as much testNxt as he wanted to try and recreate the attack. That was mid January. Cynic has so far failed to recreate this attack in Nxt, even in the benign environment of the testnet. Read the full thread here:

https://nxtforum.org/testnet/nxt-security-audit-attack-simulations-on-testnet/


Apex coin can only be taken as the poster child of POS if GlobalCoin or Vootcoin can be taken as the same for POW