No, sadly I don't agree with the author's opening statement that they are:

  "dispelling a common leadership myth: that you should lead by example.”

The article does nothing to "dispel" a myth. If anything I agree that the title of the post is incorrect and "clickbaity" when in reality it should have been "leading by example is not enough".

Setting expectations is obviously important, but the article does nothing explain how this was done. For example do they use OKRs at Dropbox? Overall I'm disappointed that so many people have "waved" (liked) the post on Medium and feel like it deserves a counter-article to set the record straight.