If I'm not mistaken Lemieux said there isn't a sbd of 8/27/72, so it can't be released.
I was actually told by those that know that the holdup is that Rhino holds the audio rights but doesn't hold the rights for the film.
A combo DVD/HDCD and/or Blu-Ray Disc release would probably be the goal with this.
Don't forget "New Riders of the Purple Sage 8/27/72 Veneta Oregon" performance has been released on CD. This release came from the Original 16-Track Reels.
Not disputing your sources, but seriously, if it were possible to release this officially I think it would have been done
a long time ago as this is in everyones top 10 of all time. I've had a 100th generation cassette of this for 30 years which
I listened to hundreds of times. One only need watch the video you posted to see what a great day it was.