I'm curious why you think the author misrepresents/misunderstands stoicism on this point.
The entire piece is that Stoicism is an individual's philosophy -- one that solves an individual's struggles. The philosophy helps confront that which you can't control...but the author is arguing that it will tempt you to throw up your hands, that you can't control anything.
The short of it is that Stoicism encourages an individual to draw within themselves and create a worldview that is acceptable. All well and good for the individual, but the world's problems will be fixed by collective action -- not individuals withdrawing.
Too much Stoic navel gazing might decrease the likelihood you join the community action board.