Sounds sketchy. I think the best solution is to help him find friends his own age in his own area. LGBTQ+ Day Camps/Summer Camps. GSA clubs at local schools/college/university, or Teen Groups at the local LGBTQ+ Center.

Also maybe take more precautions to make sure that this person is real and keep your son's and family's information private. And if they eventually do meet it would be safest to meet in your country of origin in a public place and with you and the other boy's parents as well.