The Headline is poorly written (shocker). It implies these were across the state of AZ, which wouldn’t be very significant. It is actually just one small county in AZ.
Correction: Not that small - Includes Tucson.
It includes Tucson. That city is the second largest blue population in the state.
It is insanely easy to register to vote in Arizona. Anyone can say yes to the registration questions under penalty of law for a false statement. There is no screening process. As a matter of fact, activists are in front of stores registering voters before every election.
The liars and frauds have to be caught one at a time. That is apparently what happened here. No doubt there are thousands more out there, enough to swing an election...