In my “After Cilmeri” series, Aberedw Castle is in the hands of Llywelyn ap Gruffydd, when the Normans take it in Prince of Time. David and Ieuan are held there until Bronwen and Lili devise their escape. The Aberedw castle depicted in the video appears to be the second, later one, after a search of the internet. As it is, it is a spectacular ruin of stone masonry and far larger than many of the castles we’ve seen that have been built on mottes.
One story of the end of Llywelyn ap Gruffydd has him spending his last night here. Aberedw is on the eastern side of the Usk and 10 miles east of Cilmeri, so the other story that he stayed at Abbey Cwm Hir feels more accurate to me, but there is no definitive proof one way or another.