This person is really confused about licenses and copyright.
> Please note that this code is property of Valve-Software and any contributions that you make are considered a donation into the public domain.
> Please note that this code is property of Valve-Software and any contributions that you make are considered a donation into the public domain.
So really in the modern era no copyright intended really is a message to the artist/label saying it's a fan video, they're not trying to impersonate the official one and asking for it to stay. The uploader might not know that that's what they're really asking but credit to YT for making this arrangement work to preserve some of the site's original culture.
If it's allowed the message is irrelevant, and i it's not allow it's also irrelevant as it will be ignored and the video removed.