*sigh* I think it pertains to more of the feel of the whole show, and STM was in the middle of all that, in the atmosphere...not unplugged, but there with the movement of some of the other unplugged songs. It at least has that vibe to me of being "somewhat unplugged." It's more of the atmosphere of it being unplugged, rather than the strict definition.
At least that is what I read into the OP...I "got" what he was saying.