Final answer:
The statement is false, as a black picture-in-picture could be due to technical issues, not only lack of subscription to a channel.
Step-by-step explanation:
If a customer's picture-in-picture is black, it does not necessarily mean they do not subscribe to that channel. While subscription status could be one reason for a black picture-in-picture, there are other potential causes such as technical issues with the cable or satellite box, the television itself, or temporary service outages. Therefore, the statement is false.