Some new wording in tvOS 15 via the settings for Accessibility > AirPods
Old:
"Spatial Audio:
Follow Apple TV
Follow Apple TV is on, audio for supported movies and TV will sound like it's coming from your Apple TV instead of following your head movement."
New:
"Spatial Audio:
Center Audio on TV
Centering makes it sound like spatial audio is coming from your TV, even when your head moves. If you turn off centering, spatial audio is still an immersive sound experience, but does not track with your head movement."
Old:
"Spatial Audio:
Follow Apple TV
Follow Apple TV is on, audio for supported movies and TV will sound like it's coming from your Apple TV instead of following your head movement."
New:
"Spatial Audio:
Center Audio on TV
Centering makes it sound like spatial audio is coming from your TV, even when your head moves. If you turn off centering, spatial audio is still an immersive sound experience, but does not track with your head movement."