So I see from your response on the other thread.
Horrible outcome.
Almost every day, when watching something on the TV, I'd wander into the kitchen and join my BS2 whilst cooking.
I'd warned may times about the death of B&O multi room, though hadn't quite realised this additional wrinkle.
No more purchases for a few years until absolutely necessary, or until things evolve in a clearer direction.
With Apple seemingly working on surround processing for their speakers, I woudlnt be surprised if B&O ditch this as well.
But I wouldn't want to give MM sleepless nights so soon.
I get it with TV's - as all future B&O type TV's (they're not Beovisions any more, not in any meaningful sense) will have a speaker part a la Stage, which is Airplay equipped. And in this case, a broadcast or movie playing on this setup with sound coming from the Stage lets say, I'm guessing a Balance (for ex) can join via AP. Although licensing restrictions may apply depending on the content - SKY TV's app on iOS and OSX places restrictions on what can be airplay'ed. Another wrinkle - not entirely under B&O's control, and you could easily find yourself stuck.
Alas, you cannot Airplay from the HDMI sources of the Stage/Harmony/Eclipse. The trouble with Airplay is that you can only start/stop streams from an iOS/macOS. No other sources than a streaming app.
Multiroom from the LG-era onwards will be an audio-only affair.