The Siam Rath article from where this story originates does have more details, and seems more than dinner was involved. But also acknowledges his defence......"the suspect claimed that it was a case of playing on Tinder, a dating app, with the victim willingly and not knowing the real age. In this case, fairness must be given in the investigation, which must go into the details of the case at another level"
https://siamrath.co.th/n/602345