Probably, but strangely enough not to the extent one would assume, at least not in recent years. The MetLife 2013 recording was the most doctored one I can remember, but the THINFS live series seem (almost) not doctored to me, otherwise I cannot explain why they didn't "fix" the vocals, like they did in the RRHOF for example. So, it can be done (and even I would know how to tune stuff), and it's only one song at a time. So either Jon doesn't want it, doesn't give a damn, or they're being lazy. But then, please don't release stuff at all (bar the current video, which is fine).