Thats not what he said. He said that most prostitution does not use sex trafficked persons. He also said that sex trafficking is a topic used by groups to rail against prostitution. Neither of these points argue against your point that the majority of human trafficking is for sex exploitation.
Hum... Where you parsed "most prostitution does not use sex trafficked persons", I understood "prostitution and human traffic do not have much correlation". I will have to agree that your interpretation is more charitable, and probably closer to what the GP meant, but I still want to see those studies.
I couldn't find them in a google search, that is not surprising as is quite a topic, but a quick search brings that there are 40 million people involved in prostitution, and 4.5 million have been victim of sex trafficking. That gives a rough estimate of 1/10 prostitution related transactions directly involved with human trafficking, so the use of "vast majority" is called into question.
I'm just realizing, though, that what really irks me is that the GP is using himself some kind of straw-manning himself. I've never found an prostitution abolitionist that pointed to sex-trafficking as the "big problem" in prostitution. The big problem is always women who are drawn into it involuntary, or more precisely, would very much rather do any other thing in the world. Sex-traffic is not an straw-man, but an global expression of the worst face of prostitution, and some people would say that an incidence of 10% is enough reason for pushing for the complete banning.
The reason I didn't address the second point, or the rest of the comment, is that I'm not really interested in discussing what other people discuss on such a flamewar-baity topic.
