

Yes, synching channels does not appear to work. The communities/channels are not updated, but the posts basically work if you or somebody else on your platform enter the URL of a video into the search.
Even if it would work, it probably would not update since nobody on your instance subscribed and I don’t think Lemmy federates posts of communities that aren’t subscribed. But I’m not sure how it is now.
That the comments don’t seem to work is odd indeed.
You can interact with any video and comment.
I just threw the link of the newest video into the search of my instance: https://discuss.tchncs.de/c/spacequesthistorian@spectra.video
It has one comment because I actively put https://spectra.video/w/aTouTCEzdPEdWuwsYU8LQZ;threadId=59658 into the search
Edit: I opened an issue for starting commenting from PeerTube, since that seems to be broken

Dunno how it works here, but back then on Diaspora there was at least one account that was maintained by multiple people.