While the FCC is bureaucratic, inefficient, often ineffective, overly politicised and occasionally heavy handed, this seem to me like a perfectly valid slapdown.
Intentional radiators are, when sold to the general public, somewhat regulated for a reason, and at the volumes they move there really is no excuse.
Ignoring governments in markets in which you deal is also seldom a good plan, bit like ignoring a letter from the taxman really, it seldom ends cheaply.
73 Dan.