Yes plastic trim.
If yours is the GT, I’d point the repairer to the one on ebay, Kia parts direct (also trades under Peugeot parts direct), may get it from a Kia dealer at a dicounted price and sell it discounted, but as you know they are on back order. There are others on ebay for different Sportage models.
FWIW My mum’s Kona got rear eneded and the rear light cluster, was 3 months delivery, repairer found a genuine new one on ebay and fitted that, so its worth asking the repairer and showing the link.