Interesting, for me the website and the Craigslist ad wordings give you the exact opposite of being extra services provider
Most legit providers I'm familiar with or have seen don't typically include describe their body type in their ads; I would consider specifying cash only, as well as using the term "incall" and specifying "upscale hotels", to also be signs. The "warning" in the CL ad is somewhat similar to the signs at AMPs that say they're totally legit and no extra services are ever provide or ever happen on their premises, its more to cover your ass, so to speak.
Finally, in my experience, most legitimate providers are certified and post their full name or certifications / registration / license, and also have professional headshots, rather than adding multiple selfies and using generic imagery on their websites, which is how I came to my conclusion.