Looking into this, it seems that the phrase "de-mathematize" was invented by the critics of the reforms and in fact doesn't really mean anything. What the proposed reforms would do is

1) Eliminate "tracking" which separates high achievers into advanced classes where they can't help the poorer students. 2) Add social context to math classes, such as how biased statistics led to Blacks being denied home loans while whites of similar income received them.

I'm not saying the reforms would be a good idea, especially 1), which would be terrible for kids good at math, but they aren't as silly as an attempt to "de-mathematize" the classes.