I wonder if Google Takeout would have the content? Definitely try that. Also try a GDPR request. Not sure if that will work but that might get you a backup copy

I wonder if Google Takeout would have the content? Definitely try that. Also try a GDPR request. Not sure if that will work but that might get you a backup copy if they have it. If people have watched the videos recently there might be some local cache on their computers you can grab.