Yeah, the broadcasts are in HLG.
I personally use video players built into my TVs to watch these broadcasts. Simple DLNA players or Kodi (if you have android tv built in) will play direct from the HDHomeRun and get you HDR.
You don’t get a buffer to pause, but boy does it look amazing in HDR.
I watched all the 4K Olympic coverage via YouTube TV this summer via the app in my TV to get the HDR version too.
Maybe one day Apple will add HLG support
The new Fire Stick 4K that was just announced supports HLG, so that’s a good way to watch with Channels I guess.
Dang now I need to get one and try it out.