He will have to pay it. I have never heard of a way for the Judge to waive the requirment of payment for the program/treatment.
This question should really be directed to your husband's attorney. You might be able to make small but steady payments on the fines and fees, and you should have been doing that all along. There might be a defense if the court wants to revoke the deferred after seven years have passed, but it would require that someone carefully examine all of the documents in the matter - your husband's attorney would know what was ordered, whether there were waivers of time for trial that extended jurisdiction, and so on. His attorney might already have answers for many of the questions, but a new attorney would likely have to bill you for the time to dig in and discover the answers.