I seem to recall reading about that version a few years ago, but I haven't seen him around these boards in a while. I'm pretty sure that the 'fixed' 5.1 audio he mentioned wasn't actually the dvd mix at all, as Neil always maintained (and I agree) that the 2004 audio for ANH was beyond salvage. His version used the dvd video combined with the 5.1 audio from 1997 laserdiscs, if I remember rightly.
The 97 mix sounds so much better than the 04 it's not even funny. No idea why they changed it so much. I've never owned a laserdisc player; the only 97 version I have is stereo vhs, but I'd love to have the 5.1 version. Hardly anyone actually seems to have it, though.