It confused me too so I googled a bit and it appears what’s being described is Handoff, usually to a HomePod. This Reddit page has screenshots but I don’t get the “control other speakers” option under the airplay list on my IPad. I wonder if it needs a HomePod device visible on the network before it does? Anyway, I can’t reproduce what”s being described.
Play audio from iPhone on HomePod and other wireless speakers
Stream audio wirelessly from iPhone to AirPlay 2-enabled devices and Bluetooth devices.support.apple.com
Yeah it’s a mess. One needs to create a “home hub” which needs a aTV or a pod… so not possible without those.
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