Notice it says citizenship ID. Not all municipalities require citizenship to vote in local elections. Some places let all residents determine the future of a city regardless of their citizenship status, just because they live there. ID is still checked for in person voting and mail-in ballots are sent to the address on your registration.

Citizenship is confirmed when registering to vote, so when you go to vote your ballot only has the elections you’re able to vote in. It’s why I can’t vote for a mayor two towns over even though both towns vote for the same (state & national) senator and congressman.

It’s an attempt to prevent states and cities from allowing anyone but citizens to vote AND to make it harder for to vote as the citizenship proving ID is more onerous to obtain