I listened to the first two files, I have not finished listening to the last file yet. This sounds like the 1993 DE soundtrack, which bolsters some opinions that the '93 THX mix wasn't a new mix at all, but the 70mm 6 track mix. Of course, it is difficult to tell if there are differences to the foley effects, but, overall it represents the '93 THX mix to me. For example, the blockade runner's alarms are the same, Beru's voice is the same, and there is no 3PO tractor beam line!
Kudos to David for doing this 29 years ago, as I would not have even thought to bring a tape recorder into the theater. This is an interesting listen, and an excellent reference.