Yes. I have the Denon App for my AVR which shows exactly what is being received. It will either be "Dolby Atmos - DD+", "Dolby Atmos - TrueHD" or ""Dolby Atmos". The last one is when it's receiving Dolby LPCM 7.1 Atmos, such as from the Apple TV. It's what's displayed from the Xbox.Can you do uncompressed LPCM 7.1 Atmos via eARC in games? I thought that was only available for movies, but I don't have eARC so not really sure.
It's in a Dolby MAT container so it's treated as bitstream by the TV and is passed through no problem over eARC.