As pointed out above, the thread title does not match the content of the linked article, and as Milkfloat pointed out the article doesn't say anything about reducing the numbers of white, male, middle class cyclists.
I would also draw your attention to the following in the pinned thread at the top of N&CA:
NACA is a forum for the discussion of subjects as per the forum title between individual members. A simple link post does not add to the discussion.
If you wish to add a link to your post please state either the reason why it is relevant to the discussion and/or your views on the material that you have linked to.