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I work at a GM dealer and unfortunately they have discontinued support for the theft lock radios. The bulletin that they have issued says they are evaluating weather to support it in the future. Knowing GM that means they won’t. From what I understand there is no database available at this time.
A lot of people write the code in the owner's manual or in the glove box. Did you look? You can also remove the chip to bypass the theftlockhttps://www.youtube.com/watch?v=eov0v0itnA0
That procedure won’t work on the model he is trying to unlock. That model has no code to enter. It is vin locked. If you can get the backup code out of it you might be able to google it and see if any body has the same code.
What yr's were the lock radio's ?