People are over-reacting. The decision says a federal registration form must be used IN CONJUNCTION WITH DOCUMENTARY PROOF OF CITIZENSHIP, under perjury penalty. The real problem is states like Crapachusetts which gladly provide illegals with fake proof of citizenship.
Not how I read it.
They only need to aver (swear) they are citizens under penalty of perjury. That’s the Federal Form law/usage.
Arizona requires proof of citizenship for state level elections. They can continue to do so at state level, but for federal elections a simple attest to citizenship is the law.
So if Arizona wants to go after voter fraud, they are going to have to make the effort post election to investigate under probable cause those who are not registered to vote in state elections, but registered to vote in federal elections.