I'm not sure it really matters - and not just because Dorsey isn't CEO of Stripe. Whatever you think of him, whether you'd agree with them or not, the advice is

I'm not sure it really matters - and not just because Dorsey isn't CEO of Stripe. Whatever you think of him, whether you'd agree with them or not, the advice is good: you may want to bear your thoughts in mind, whatever they are, before applying to work at a company for which he is CEO. (Of course, if you're careful to frame it equivocally, as hopefully I've managed to do, it does come out sounding a bit, well... obvious. But that's fine. Sometimes good advice is obvious.)