The delivery address of your customers items is irrelevant for a VAT refund. Relevant for refunding VAT is proof of export to a country outside the EU or the presence of a certificate of VAT exemption bij an authorised government body.
If the export of the goods and your customers non-EU residency has been checked by customs, you are allowed by the tax administration to refund VAT.
You can read more about export and customs procedures here.