Nothing in this article screams controversial to me. I also don't see a problem with wanting to hire more women in tech. These differences outlined do not all appear advantageous or otherwise disadvantage one gender over another and lend better credence to being a great engineer. Anything that makes that claim is conflating a false narrative on extremely weak grounds.
Having said that, the memo is a trigger for people on multiple extremes. The reaction from both sides of this reminds me of forums on parenting nature vs nurture.