I tried it again with "La Légende d'Er" that I have in both 5.1 and stereo mixes (so I know what it is supposed to sound like in discrete surround) and got the same results (obviously not with the same 96/24 quality, but the positioning is right).

The funny thing is that, for normal 2-channel music, I don't like Neural THX all that much. Don't hate it, just don't care too much about the result.

So there really must be some natural (or intentional!) connection with some of the tools they use to downmix multi-channels and Neural THX listening mode.

See Mojo's signature