If he intended to treat people as individuals, then he wouldn't have resorted to gender stereotypes in the first place. The essay was clearly designed to tell women they don't belong at Google. Would you feel comfortable working with someone who wrote an essay at your workplace which detailed incorrect gender stereotypes about men ("Violent", "Incommunicative", "Ego/Status driven") as a way of gently saying maybe we shouldn't hire so many men anymore?

I can already visualize the intense white hot responses over at /r/mensrights and other such places. Where they already freak out, and "virtue signal" as you put it, over much much much milder stuff from feminists. Many people would call for the author's head, and I suspect we wouldn't hear so much about "free speech" from the MRA and other conservative outlets.

Edit: If any of the downvoters doubt my hypothetical, just think about what happened to Anita Sarkeesian. There were no statements about her bravery or defenses of her free speech rights from the conservatives. Just a wall of criticism and boycotts (and worse) in an attempt to get her to shut up. Whole lot of virtue signalling from men on the right, many of whom self-admitted to never watching her videos.