There's no hyperbole in the comment. It can still be a safe haven for extremists even if most of the users are not.
> the world is a little more complex than "privacy at all costs."
The line doesn't have to do with the infringement of privacy, it's about whether that infringement is being done by publicly sanctioned power, or the whim of the arbitrary, domineering power of private (tech) actors. Elizabeth Anderson has written quite well on this topic in "Private Government."