Playing audio on Apple TV and streaming music from app both playing simultaneously thru HomePod Stereo pair

If you have the AppleTV 4K and hook up the HomePod speakers to replace the tv speakers (HDMI ARC) then when something is playing on the TV, for example a Sharks Hockey game via DirectTv Satellite on Samsung TV, then you open up, say Amazon Music and start streaming the latest (misc musician or group) and select to play the music thru the HomePod speakers— you will have both audio sources playing simultaneously until you with pause the Amazon music app or turn off the Direct Tv. If you just mute your TV (with either Samsung remote or Direct TV remote) the HomePods will be muted completely, you can not “un-mute” by just turning up audio on Amazon music app— you must deselect mute on tv/cable box and then just kill whatever you don’t want to hear the audio from (ie Directtv satellite, cable box, VCR, BetaMax, DVD, Laserdisc, Sony MiniDisc, Record player, desktop or laptop computer, cassette tape player—standard and/or mini-cassette for the hardcore dictation machine lovers-, or even the ultra-rare follow up to the mega hit everyone loved, the Sega GameGear… better known as the awesomeness, the true Goat of HandHeld Consoles, the extinct Genesis Nomad <peace be upon it> or any other source plugged into the tv). What was I talking about again?