[anigbrowl]

No it doesn't. That ruling is about the illegality of deploying a wi-fi protocol that's meant to interfere with other communication.

A purely passive barrier to electronic signals is a completely different thing. There are no rules against Faraday cages, and the FCC is perfectly aware of them and what they are for; it OKs the use of Faraday cages for use with experimental radio technology that would otherwise require a special permit.