i think many ppl didn't actually get any confirmation from Amman; u just need to assume ur file is there too; or maybe in Ankara who knows ??? for sure not in Damascus, they r closed
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i'm sorry for his situation
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he should just flee where he thinks it's safe; he had his interview already so there's no more need of phisical presence at the embassy
at the moment he arrives in the new place he should just send an email to the embassy to let them know of his new location, contact number and mailing address; best of luck and hope he stays safe!!
that's just opinion from my own logic, like u i have no idea of what those officers do or think

but they will for sure continue his process no worries there