I don't know anything about Sound and Fury. But I can tell you that I've seen this in person. A family member of mine who is profoundly deaf had NO ASL and NO English (written nor spoken) before he got implanted because oral-only did not work for him at all. Only hand-made signs. He got implanted when he was about 6 years old. He also went to a oral deaf school designed for CI students. By the time he was 14, he was mainstreamed, spoke better than me, and could talk to his friends on the phone. When he was 16, he met a Deaf girl and got involved in the deaf community and signs now too.
So I am not surprised by the capability of the CI to change someone drastically along with an education methodology geared for CI recipients.
BTW I am not saying that the above method was the ONLY way to get him updated to his peer level. It's possible that if he went to a deaf school, he could have the same results.
Although, they found out later, when he finally had language, he was legally blind also. Not sure how that would affect his visual reception of ASL/fingerspelling..... It's all very interesting to me!