Canada Supreme Court Strikes Down All Current Restrictions on Prostitution

[Kurska]

119. Gee, you think maybe that REPORTED trafficking increases because of increased visibility?

Not because of an actual rise in number of people being trafficked?

Even the author of your article states that the information available is very imperfect. They even warn against using the data to justify keeping prostitution illegal, something you appear to have chosen to ignore.

From the SEO-YOUNG CHO article

"Naturally, this qualitative evidence is also somewhat tentative as there is no “smoking gun” proving that the scale effect dominates the substitution effect and that the legalization of prostitution definitely increases inward trafficking flows. The problem here lies in the
clandestine nature of both the prostitution and trafficking markets, making it difficult, perhaps impossible, to find hard evidence establishing this relationship. Our central finding, i.e., that countries with legalized prostitution experience a larger reported incidence of trafficking inflows, is therefore best regarded as being based on the most reliable existing data, but needs to be subjected to future scrutiny. More research in this area is definitely warranted, but it will require the collection of more reliable data to establish firmer conclusions. The likely negative consequences of legalized prostitution on a country’s inflows of human trafficking might be seen to support those who argue in favor of banning prostitution, thereby reducing the flows of trafficking (e.g., Outshoorn, 2005). However,
such a line of argumentation overlooks potential benefits that the legalization of prostitution might have on those employed
in the industry. Working conditions could be substantially improved for prostitutes—at least those legally employed—if prostitution is legalized. Prohibiting prostitution also raises tricky “freedom of choice” issues concerning both the potential suppliers and clients of prostitution services. A full evaluation of the costs and benefits, as well as of the broader merits of prohibiting prostitution, is beyond the scope of the present article."

If you're basing your argument on this article, I would have thought you would have actually read it.