So, the charges listed the times Kraft was at the "spa". The affidavit's surveillance log also lists times.
This means Kraft is "Male 8" and "Male 13".
Male 8: 40 minute visit, got a handy from 2 workers, Lei Wang (age 45) and Shen Mingbi (age 58).
Male 13: 14 minute visit total, got oral sex from Lei Wang (age 45).
So, everyone up on Kraft for how he would've obviously known it was sex trafficking... how? Lei Wang has been charged as being the manager of the place. Shen, I don't know much about her other that she was reported there on the day the health inspector got suspicious. Both women who have been claimed to have been in charge of the spa lived there, slept there.
So, where is the trafficking? Did Lei Wang traffick herself? Was Shen Mingbi really an enslaved sex slave at 58 years old? I guess it is possible. But I would say, not probable. I certainly would say that Kraft would not have a strong reason to believe the lady in charge of the spa and her older friend who worked there were somehow there against their will.
I'm sure more will come out in the coming days, but if I had to make a bet right now, this will not yield any charges for sex trafficking.