Apple

That software update only allowed audio from Apple TV, itself, to be shared.

Before you might make use of the new ARC feature, you must set up your system properly.

Instead, ARC is only compatible with the larger HomePod speaker, which the companydiscontinued earlier this year.

Apple TV 4K audio output settings page

Apple

ARC is only compatible with the larger HomePod speaker, which the company discontinued earlier this year.

Bringing universal audio passthrough could be a logical step towards something of that nature.

However, such a gear has yet to be officially announced.