So I checked out the mono track on another rip (not of this one, of the SE).
Clearly, the mono is remixed and is not a fold-down.
I’m guessing some low level theaters got the mono mix initially, and Cameron being then the crazy director he was, did custom mixes for different theaters (ie some got the stereo mix DS, some the mono mix, some the 70mm 5.1 mix)
So a rip of the mono mix would be nice, it levels the film with the original, and really crunches 😃