To be anal about being anal, the article doesn't preclude Fleming's account. It argues that it's unlikely, but countless highly improbable things are happening every second. On this topic somehow Ancient Egyptian poultices (and in cultures onward - though they are the oldest recorded account) even used moldy bread to treat bacterial infections, somehow stumbling onto genuine antibacterial aspects for an absurdly counter-intuitive treatment that has a real effect. However it was initially discovered back then, let alone replicated and confirmed, must have been through an unimaginably improbable series of events. Yet it happened. That's rather the story of humanity.