What does that even mean? If regulators say it's illegal to comply with the license terms, you can't use products released under those terms. It's not like the GPL'd components fall into the public domain.
There's a legal order of compliance. You don't get to break the law because you agree to a contract that stipulates you're going to break the law.
In this case, I bet the interpretation would be that if a piece of software requires you to break FCC law if sold as part of a Wifi router, then that software cannot be sold as part of a Wifi router.
