That's not proof of anything. That was back when The War Z had no info on it, and in a short amount of time they've produced lots of content via screenshots, interviews, and gameplay videos, and the alpha being sent out. I've read that and watched the stupid video RhinoCrunch or whoever has on the subject and they are just biased against it for some reason. I myself have kept an open mind, and while the engine looks better yet shittier, I am openly embracing it until the standalone DayZ drops. Videogames are always copying each other, and if it can do it better and/or can fill the void there will be for a while, or makes DayZ realize they need to get shit together like hacking, so be it.