So many Yuzuru's performances are erased from Youtube. I can't believe SBS copyright thing because it's too wierd and not affecting Kim Yuna's videos on YT. Nothing is announced officially. On Twitter, ISU was asked why they're deleting videos but they replied, " I don't know what you're talking about."
Years ago, when Vocaloid became popular, fans uploaded translated videos. Suddenly, hundred of channnels were deleted by fake copyright holder. So they sent counter notification. Their channels were back and community was saved. They used nicknames and didn't have to write precise or real address. It wasn't that hard. Please Google " Counter Notification Requirements Youtube " if you want to try.