Yes. Also, they could look into not cramming a dozen women into small, dirty rooms which they can't leave, holding onto their passports, constantly shipping them off to different places so that they don't know where they are and can't develop any type of support structure - things like that. Given the number of legitimate prostitution services which don't do things like that in places where prostitution is illegal, they aren't really a necessary part of the business model and anyone who runs a prostitution company that doesn't base its business model around the raping of sex slaves would be free to not do any of that. If they're going to do that, then they really can't complain about people saying that their human traffickers ... since that's actually what they are.
Even the sheriff who led the (very probably) unconstitutional suveilance operation admits that there is no evidence of human trafficking.
Outspoken Florida sheriff admits they can't prove human trafficking in Kraft case
Imagine - they have done invasive (hidden cameras in massage rooms) surveillance long enough to ensnare 100s of customers in BS "solicitation" charges, and yet they failed to obtain any real evidence of "trafficking", the ostensible goal of the operation.
Now, some of the things you say would point to likely trafficking. Keeping passports for example.
If true (a big if) that would be pretty good evidence. But apparently they only have things like the living conditions of the women. While that is indicative of poor working conditions, and an employer who cuts corners (reason enough for me not to patronize that place), it is not indicative of trafficking, i.e. keeping these women against their will.