In the system I've proposed, if there are enough test-Flanders thrown at the content the times closed should be different enough to trigger an unclear Flanders rating. This would indicate some other metric should be used.

I don't see this test working in isolation. Given it's nature, it's value is in obscure rejection statements rather than acceptance (or "okilly-dokillies" in this case).

To echo what others on this thread have said, there's a lot of content on Youtube. This means that even if they are cautious about which content passes through the filter for kids, there's still a lot available.