The person in the other thread is incorrect, an Apple TV connected to HomePods can be configured to advertise HDMI Audio Return Channel so that anything your TV is displaying has its audio routed through it.
Having said that I eventually replaced my pair of HomePod Minis with a Sonos soundbar because I wanted something with a bit more oomph to it, although I'd maybe have considered getting a pair of the big HomePods and using the Minis as rear speakers had this been available at the time.
Having said that I eventually replaced my pair of HomePod Minis with a Sonos soundbar because I wanted something with a bit more oomph to it, although I'd maybe have considered getting a pair of the big HomePods and using the Minis as rear speakers had this been available at the time.