From the information in the article you are right. If there was more to the story they really need to give the details. Instead they just grouped him together with the other piece of trash.
I will say most 15 yo Thai girls could never pass for legal age, especially in the eyes of a foreigner. Could he have felt bad and just took her to dinner and dropped her off? They should be publicly accusing these people of exactly what they believe happened, or at least explaining the basis for charges.