How is the FOSS Smart Tube app on Android used with what they call a set-top TV?

Recently the FOSS NewPipe YouTube clone broke because Google changed their
public API (apparently to stop the unrelated rampant bots) so I used my
standard workaround of downloading using the FOSS Seal downloader instead.
 <https://github.com/JunkFood02/Seal>

But... what was suggested by some was the FOSS Vanced & Revanced APKs
(which I'm aware of, and which have lower functionality) but also the FOSS
Smart Tube APK which is advertised for "Android-based set-top boxes & tv".
 <https://smarttubeapp.github.io/>

Since I haven't used a TV at home in, oh, I don't know, twenty or thirty
years, may I ask those who do use TVs every day what that app does for you?