I think the point is that you simply don’t know in a lot of these videos. They’re random bystanders, not known figures with photographic evidence. So you’re not going to know what to recolour it to, or if it’s even wrong in the first place.

Not all shades of skins are the same within one specific demographic.

Unless there's also a way to accurately extract the specific hue, you will never get anything accurate.

Anyone that ever wore foundation can tell you that human skin has tones, undertones, different reflective qualities, etc.

Just look at https://www.temptalia.com/wp-content/uploads/2018/05/summer-... or https://cdn.shopify.com/s/files/1/0009/0000/5932/files/Shade... or this https://pbs.twimg.com/media/B_zp3U1XAAAk4Iz?format=jpg&name=...