Customers Shipping Address won't change

A customer has recently moved house and changed his address accordingly but it has not updated and I posted his item out to the old address as I had no way of knowing. What's going on? 

Hi there! 

Customers are able to edit their saved shipping address, but this does not apply to future renewals of subscription products automatically. To change the subscription shipping address, customers must cancel the subscription and re-subscribe using different shipping details.

OK so he's a subscription customer and therefore he needs to cancel the subscription and re-subscribe with new address...correct?