my guess is Hero's Keep, only because it is called the castle of aargh! and a keep is a part of a castle and it was a level that certainly had a lot of aaaarghs with all the fog pits and pad combos. But if so, it is clearly a very obtuse remix. But that would also be the case for temple of retribution as this level bears very little in common with either of those (retribution is more open, does have the arcs and gargoyles, and item combos like pg/mh) however it is neither a castle (e.g. it is a temple) nor were there any aaarghs from pit falls.

My guess is the claim that it is a remake of a well known Q3A stock level is a red herring and a joke, and that castle of aargh is an entirely original level, however based off the tropes of the Q3A stock (pits/voids, castles/dungeons etc).

Another great map from this guy! Thanks!