But that can't be left to the claimant. So Google should charge a fee for each complaint to cover the cost of the verification. But then you could make the company pay more simply by uploading thousands of infringing videos…
In any case a simple air date sanity check would have prevented this particular case.
By "certify", GP might mean "certify under penalty of perjury", where the specific wording (which would probably need some notes about certifying they had verified their ownership) is strict enough to give one a bit of legal ammunition against false complaints.
In any case a simple air date sanity check would have prevented this particular case.