I believe you are asking why the app now named Lightroom Classic CC can not upload video for Lightroom TV. Lightroom Classic CC can import video, but not sync them to cloud storage.
To upload videos for playback in Lightroom TV:
Please import and sync videos from the new Lightroom CC app, Lightroom CC for iOS or Android, or Lightroom Web (lightroom.adobe.com).
Please let me know if you need more help.
Do you mean that with the new LR, you can play videos in the ATV App?
I use LR Classic which only syncs photos. That works great on the ATV App but my video clips are missing. Is that feasible with the new LR: create collections and play photos and videos on ATV?