Almost all erotic massage parlors in Marseille are run by the Chinese. The remainder belongs to the Thais. Those won’t advertise online, but the further from the port the seedier it gets. It’s also where the chance for a happy ending is the highest.
I’d recommend going to a French studio instead; those are usually good when it comes to sensual massage in Marseille. Pleisir des Sens (https://plaisir-des-sens.fr/) at 440 Avenue de Montolivet gets top-notch reviews. Lisa (http://mnbylisa.fr/) at Rue d'Italie does an amazing outcall “naturist” massage. Kailasa (http://www.kailasa.fr/) at 25 B Avenue Pasteur is one of the best Asian spots in Marseille.