Can't answer your question directly, but moved your post to the YouTube TV thread for Channels TVE so others using YTTV as an auth Provider can answer.
No matter who your auth provider is, all TVE streams for Channels come from the networks live web stream.
So YouTube TV, DirecTV, Fios, Xfinity, Sling, etc. subscriptions are just used to authorize you viewing/recording a particular network stream like A&E, NFL, MSNBC, NatGeo, Discovery, etc.

