I don’t have any evidence but to me, Beggar’s Canyon in the latest episode looks like a new miniature that’s just very accurate to the original version.
These two actually look quite different to me. Yes, the camera angle, FOV and lighting has been altered, but the rock faces look very different–i.e. the cracks and striations don’t match. They either went all out and made a new miniature for just this one scene, or it’s a very good, but not identical, CG model or digital matte painting.