...
It's mixed on 7.1.4 but there's enough swirling around to fill larger systems, I'm sure.
...
I have 9.1.4 (with Wides) in my Home Theater. I have talked in this forum several times about the advantages (for me) of having content for the Wides in the Atmos mixes.
I cannot test (yet) your Atmos mix, because now we are at summer house (without Atmos system), but I have decoded your Atmos mix to 9.1.6 and actually there are vocals content on the Wides and some synth on the Top Middles, so all 16 channels are used, thanks to your use of objects and not only bed channels.
Looking into the Audacity 16 waveforms I cannot 'feel' the inmmersive Atmos, I only see some bigger level on fronts than in the rest of channels, making it, perhaps, a bit conservative front centric mix, but with full 16 channels immersive surround.