I read it as something like this: "We really promise not to mess up your account. Really-really. Oh wait, our server has been hacked".
You still haven't read the FAQ:
However, we never store your authorization tokens in our server, and instead just directly pass your authorization token into a client-side cookie.
Never store != never see
If you really want to contribute and fear for your actual account, you can still create a fresh new one and just use this one to add some comments where you feel to.