I think it is probably tantamount to completely unmixed at that point and is a playback from whatever recording package they were using rather than a bounced/exported file.

I do wonder whether they had the discipline to keep all their earlier versions or whether they did exactly the same as the rest of us often do & saved an updated version over the top!

But, overall I agree with you: it would be great to hear a pre-Lipson version of at least some tracks and a CD copy that has not been brickwalled to within an inch of its life in the mastering process.

And a vinyl version that doesn't have bubbles in the wax.......