I'm pretty sure the manual review consists of checking if it was flagged by their "AI" and that it indeed was flagged by the AI and therefore it must be right
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Replying to @DeMickyD
just heard back: after careful review, we've confirmed that the age restriction on your video won't be lifted. we know this wasn't the outcome you expected, but please learn more about our policies here: goo.gle/3SaAyqb lmk if you have any other q's