So it may not have been the UK’s Christmas #1 single, but it seems that the song has become a viral hit. Not sure if an entry should be made for it though.
I’d wait. Hold off until it has a few more derivatives with a bit more popularity. It certainly will need one eventually.
No, I haven’t seen anything other than the original video and his official MV. You could wait, as it is liable to derivatives and such, but I don’t think you should add an entry.