Imo there's an important distinction here.
The article specifically talks about Asian women as a fetish for the average American male.
Mongering in general, is whole other can of worms. You bring the two together, it's worth separating these imo.
P4p has always been looked down upon as an activity. The idea of selling and buying transactional sex doesn't sit well with a lot of people. Ironically, in a land where lobbying exists and is considered a norm, where voices and thoughts are routinely bought and sold, p4p is somehow vile and immoral. Even though much of casual sex is indirectly sold anyway.
Now to go back to your question, well if providers were only looked as a mean to provide the service, then it wouldn't matter whether or not they were Asian, right? Why would ethnicity matter then?
So your question is more of a general mongering question. I think the question that needs to be asked is... how are Asian women, including sex workers different from non-Asian, non-american (white) women and sex workers. And the answer is then a part of what you said, unfortunately. Stereotypes wise, the Asian woman APPEAR to American males as slim, tight (yes, there), somewhat docile, more obedient and submissive, while being smarter on average.
There is absolutely zero excuse for not stopping doing what the provider is uncomfortable doing. There is zero excuse for treating a provider like a piece of meat.
My take on the whole atl spa situation is that, if indeed this loon thought of spa as temptation, it's because it's the type of p4p that is easily the most accessible one. Probably the only type he could get in and experience, and it just happens that a storefront amp is the easiest, most accessible and most 'safe' p4p there is (streetwalkers and cheads are not safe) . The girls working storefront are a butt of many happy ending jokes. And storefronts tend to be mostly Asian. That's now things work.