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In the video he said that we recognise it as brown because we learned the name for it and thus recognise it independently. Is that idea compatible with us having more red and green cone cells than blue - i.e. having more resolution to recognise brown?

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Also a matter of context. Brown is orange and grey can be red.

https://www.youtube.com/watch?v=MJBfn07gZ30

Here's a part of a documentary talking about the cultural aspect of how we perceive colours and the power of naming a color (with the Himba people)

https://www.dailymotion.com/video/xl7eh1

There is certainly a cultural aspect to it. Tom Scott's video on the matter: https://www.youtube.com/watch?v=2TtnD4jmCDQ

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