Good question. I tried to find out a while ago, just out of curiosity. Unsuccessfully. But somewhere in the thread about this mod on http://heroescommunity.com/viewthread.php3?TID=36889, there should be an answer to this question.
NCF is too well-known. That's why they take models from wherever they can. I myself use one model (cherub) on the map "The Price of Loyalty," but the credits mention the NCF team. I periodically update this list. If possible, I will indicate the name of the model's actual author.
That's great! By the way, which version are you using – the sword like the one HERE?!

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1