Judging in what I've seen/heard, it would kinda make sense to me that they choose to NOT release this for the following reason:
The vocals are weird, and JLB has already been in the hot spot for critics in the past few years (I mean, he has always been in that point but I feel that the nay-JLB-sayers have been going uphill ever since The Astonishing Live was going on). So, releasing (officially or unofficially) this would give them more reason to hate on him and it wouldn't be good to the band's image in any way.
I hear some of the lazy autotune work that has been mentioned, and that has nothing to do with the chorus-y effect that plagues the vocal tracks. It's really evident in a couple of the songs, and if this was the case this is really something to do with Chycki's mixing process. That's not cool in any way.
I just watched it, and, probably because I just sat through the vids, enjoy them a lot and not putting a lot of attention to the sounding details, I didn't notice at all what you and others are saying about the vocals.. I mean, yeah, maybe if I see it again now I could hear it, but about your concern about the band's image and all that, I think hater's gonna hate.. If they don't release this officially then James' haters will complain anyway saying that they didn't do it to not be criticized for the poor performance of him, when we know that's bs, he was great..
I just tell my personal experience because I'd like to think it's how the average DT fan would be watching this show, just enjoying it for what it is.. I mean, I even happen to read the description informing about the vocal issues before watching it, but even so couldn't hear anything wrong with James' voice..
(fun fact - I actually know the guy who uploaded the videos, and his father is going to mix my band's new album)