Would you agree that, if the gender disparity in an industry is caused by factors outside of the "natural ratio", then correcting those factors does not necessarily imply perpetuating discrimination? Or put another way, if you are holding a race where person A starts at the 0-yard line and person B starts at the 25-yard line, and you make them start from the same place, you are not actually favoring person A and discriminating against person B, but merely equalizing the playing field?
It is a hard problem, and I think most people want the same/similar outcome. We just need to acknowledge that we don't all know the best way to get there and be able to talk about it. I think that is what the memo writer was really saying is that these are important issues with lots of things to consider - we can't afford to silence voices - especially relatively rational ones.