Well I suggest that you reopen your case and contact them showing them this...
with the following link:
https://www.apple.com/ca/macos/monterey/features/ --> refer to footnote 2
"Spatial Audio is available on Mac models (2020 or later) with the M1 chip using internal speakers, wired headphones or AirPods, Intel‑based Mac notebooks (2018 or later) using internal speakers or wired headphones, and Intel‑based iMac (2018 or later) using wired headphones." -Apple Support (twitter)
UPDATE: I spoke to a senior advisor that actually escalated this issue to the engineers (disk image was sent and a follow up was booked). 2020 M1 macs DO have spatial audio support.
If enough people escalate this issue to the engineers we will be able to see this issue actually get resolved!