To be honest, I don't know how the source got created. I only thought it could have been one-touch because I haven't attempted to add a source other than that. Anyway, thanks for the advice but that didn't delete the source. That makes sense as there is no tubi-for-channels docker image in Portainer. So, it appears that the tubi-for-channels project did not get created.
Although there is no name on the source itself, "HDHomeRun" appears at the top of the context menu. Please note the context menu in the attached image and the absence of the trashcan icon.
Here's the standard out for the delete of the project:
Deleting CDVR Custom Channels Source - TubiTV...
true
Deleting CDVR Custom Channels Source - TubiTV-NoEPG...
true
Portainer reports the stack ID for tubi-for-channels as ...
Stopping Portainer Stack ID ...
Deleting Portainer Stack ID ...
404 page not found
Portainer reports the image ID for tubi-for-channels as ...
Deleting Portainer Stack ID ...
{"message":"image name cannot be blank"}