His messages confirm something that's been rumored for months. In fact, ETF vocalist Craig Mabbitt referenced Green's departure in a November 2011 interview video, which you can watch below.
Well everyone, I'm doin good. No I'm not playing in ETF anymore. Long story, basically personal and perhaps slight musical differences.— Max The Ripper (@max_the_ripper) March 5, 2012
I don't think it's how anyone WANTED it to go down, but everything happens for a reason I guess— Max The Ripper (@max_the_ripper) March 5, 2012