Fascinating. So it sounds like the process was as follows:
- Michael Brauer mixes album in stereo from original multitracks, then exports stems from his session
- Fernando Reyes receives stems and does the spatial positioning over headphones
- They both go to a real Atmos room to check the results and make final tweaks
I'm kind of surprised that someone of Brauer's clout doesn't have regular access to a real Atmos mixing room - and I got the vibe that the stereo remix was what he really cared about, and the Atmos was an unimportant side-request from the label that got passed off to his assistant - but the results do sound pretty good in 7.1.4 off Apple Music.