This is correct but it's a little different to the 12 month credit card waiting/exclusion periods.
Red will pay the signup bonus once per NMI every 12 months, regardless of when you were last a customer.
You can sign up, stay with Red for 11 months, churn out to another provider for a month, and then
churn back to get another bonus. I am in the process of switching to AGL for this promo and will switch back to Red as soon as the AGL SUB posts.
Per meter NMI/property address. You can't switch the account between different residents and receive the bonus multiple times. (I have tried!)