Now as to why I think that this club is ok, is not because I think that skin colour has any relevance in learning to code. Also, if I thought they were being exclusively for black girls, rather than just targetting them, then I would not give this any time, but that seems to be evidently not the case.
The sad fact is that skin colour has deep relevance in the US because it is still such a deeply divided and institutionally racist country in many ways, especially if you do not have enough money to sugar the pill.
If you are a teenage black girl in poverty in the US you are bombarded with media telling you what defines a teenage black girl in poverty in the US. You are marketed to as a teenage black girl in poverty, you are educated as a teenage black girl in poverty.
And unless you are unusually idiosyncratic, you will already have bought the story you are being sold by the time you are a teenager.
Most people buy the story they are sold by the society around them.
As far as I am concerned, given the society and history of the US, the club BlackGirlsCode is not spreading the message, "coding is a black thing", it is spreading the message "black girls are able and allowed to code", which is a positive thing. It isn't forcing people to think of themselves in a certain way, it is trying to start with how the people they are trying to help are already viewing themselves, it is accepting that the society is really screwed right now and so sod trying to destroy tribalism in one fell swoop, as that is a big job and may take a few more generations, lets try and get people to widen their horizons and do something about the massive technological literacy gap. Clubs called BlackGirlsCode in the US are needed for exactly the same reason that organisations dedicated to literacy for Dalit women in India are neccessary.
Personally I would rather that society drop the whole black/white thing altogether as a description of skin colour, as not only is the binary designation one of the most heinous divide and conquer traps that is going, but I think that the terms are also woefully inaccurate and unfit for purpose as descriptive adjectives. However I rarely get a good response to that, so convincing society in general of that one is really more of a long game.