It will do this if you have an Apple TV, the same as other Airplay speakers do now.
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This bit about HomeKit is completely wrong - Alexa and Google Assistant aren’t even smart home platforms, if you don’t get an Echo Plus (and if you glance at reviews you’ll see how terrible that is) you can’t have it do anything without you specifically asking it - no timers, no occupancy status, no motion sensor actions, no automation whatsoever. HomeKit as a platform is actually light years ahead of the competition - and its occupancy status geofencing features are absolutely brilliant if everyone in your household has an iPhone. It’s also the only platform (besides Hue, which came first) that isn’t going through the internet to turn on a lightbulb 3 feet away from you.
The only problem with HomeKit is lack of device support, which Apple doesn’t have much control over since they opened up the API’s.