Simply achieving synchronized transmission and resolving the issue of video lip-sync due to latency doesn’t mean that Apple TV can seamlessly transmit Dolby Atmos via AirPlay and Bluetooth.

The primary method still involves delaying the video—a technique previously limited to stereo and Dolby Digital 5.1 formats but now expanded to include Dolby Atmos. However, devices connected through AirPlay and Bluetooth will continue to default to stereo output.
This clarification is essential to prevent this update from being misinterpreted as an “epic breakthrough.”
Here are Apple’s release notes:
This update introduces support for synchronizing Dolby Atmos playback to speakers using AirPlay or Bluetooth. To enable this feature, navigate to “Settings” > “Video and Audio” > “Wireless Audio Sync.”