Power corrupts and just because these "coucilmen" were elected, doesn't give them "supreme power". They are subject to all state & Federal laws, especially the pre-emption laws.
The local courts routinely "ignore" pre-emption and get themselves in trouble over it.
Same happened here in Idaho at the city of Moscow. They screamed and wrung their hands about it, but TS.
Glad it was pointed out and corrected!