If you AirPlay a song from Apple Music to the HomePod, does the HomePod play that song directly from the cloud, or does it play via the phone, like a Bluetooth speaker would?

I asked a variation of this question some time back and although there was a decent amount of conversation about it, no consensus was ever reached.

If I am listening to Apple Music, or Pandora, or any other 3rd party service that the HomePod officially supports, via its app on my iPhone and then I AirPlay that audio to the HomePod, is that audio then being streamed from the cloud to the HomePod, or is it being streamed from the cloud to my phone and then to the HomePod (like a Bluetooth speaker would)?

Can someone definitively answer this?

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