I am having a couple of issues with audio synchronization, using 2 homepods as a stereo pair.
Frequently the two speakers are slightly out of sync, creating a nasty reverb/echo effect.
And/or the video is frequently out of sync with the audio, sometimes by quite a bit.
Sometimes changing to another app, and then back to infuse, will cause the audio to sync. Other times rebooting the Apple TV is required,.
FWIW: Most other apps do not have this issue (Netflix, Hulu, etc), but a couple other do (Channels)