I've had this theory that recent technical problems with Youtube, had a common cause.
The videos that never finish uploading, missing/delayed/duplicated notifications, website outages, videos being blocked/banned by accident (youtube's own twitter account admitted to this happening), website outages.
That cause is data corruption, something is really wrong inside Youtube's storage array.
This video having it's upload date changed is proof of this, the date was invalid, so youtube put the current date in, along with assuming it's a new upload.