How do the registrations fall? Someone clean the voter registration files? I can see it if they are talking about new registrations, but they’d fall also as you approach 100% registration. Now the story claims when they move they lose their registration. Exactly how does the voter registration office know you moved/sold or lost your house unless you notify them? This is a typical BS story that editors should be asking questions about the sources and methods.
You can do that with welfare rolls as well ~ and I've seen it done. First time it happened it cleared out half the beneficiaries.