To me that sounds like they took the ability to enhance faces (A specialized specific model) from Photo AI, and found a way to integrate it with a Proteus-like video model.
The search on these forums is not the most useful. I remember many statements about Iris before it came out, being something along the lines of how it was being made to detect and enhance faces.
Sure enough, now that it is out, that is exactly what it does—even if erroneously sometimes.
