I think Leaning In is easy when it's a general statement. I can't think of a less controversial position than "women should be entitled an equal position in the workplace," except for maybe "racism is bad." (I grant that it was not always this way. It's good that we've come this far.) But the position is considerably less costless now that there's a completely unpredictable administration in power. The author of the article is right for pointing out that you can't help but view this as a test for Sandberg and Facebook. Do you want to wager what they're reaction will be? It seems we're already getting a taste of it: don't risk the ire of Trump, and before we publicly advocate an ethical worldview, let's run a cost benefit analysis.
The cheap and easy criticism of Sandberg has always been "well of course you're striking a blow for equality and equal time in the workplace you're like a billionaire'n'shit." I'm of the opinion that Mark Zuckerberg is an asshole and anyone that works for Mark Zuckerberg is an asshole. Assholes do as assholes do.