Hideo Kojima is recognized as being one of the greatest game developers of our time, so, naturally, people might be influenced by his words and actions. Whoever is behind the Joakim Twitter was apparently banned from The War Z without explanation. In return, he lashes out at the game by admitting it was a huge mistake to buy it. To add insult to injury he also tweets directly to Patrick Bowman, community manager for The War Z, calling out the development team for being the "lowest common denominator of game development".
We did our research and discovered that of the thousands that were banned, Hammerpoint Interactive did wrongfully ban a small percentage by error, so it is safe to say these comments cannot be considered slanderous or defamotry.
We also believe that Joakim N. Mogren's Twitter page is an official PR source for The Phantom Pain, especially considering no efforts have been made to shut down the account, and numerous notable industry professionals seem to be Retweeting some comments from this account.
Whether or not this Twitter account is, in anyway, linked to Kojima Productions it is certain that these remarks will have an impact on The War Z sales.