Earlier quoted context omitted.
Not quite. He didn't write the memo to say he's a misogynist or a political conservative. He wrote a memo implying the women who worked with him may not be as competent as the men. Now replace "women" with any other group, such as people of color, Jews, armed forces veterans or Republicans, and see how it goes.
I’m talking about the liability of somebody sitting in the same context, wanting to talk about it.
If he was uncertain about hiring policies and thought those were negatively affecting productivity, he should have taken the question to his manager or to HR, along with some evidence.