Whatever his motivation, I think it's a fair question to ask: if people are using BDSM as therapy, then from what kind of abuse? Do victims of sexual abuse use BDSM as therapy to recover from sexual abuse? From childhood sexual abuse specifically? This is just looking at it from the other end, seeing the abuse first and the potential for this boy to use BDSM as therapy in later years.
Why talk about BDSM as therapy from one end of a person's life (the therapy end), but object to talking about it from the other (the initial abuse end)?