cannot answer a question like is this specific mechanic unique
Yes!
They are trained on material where people would talk about games. And players rather seldom talk in detail about specific technical game mechanics and how they are different to other games.
And they might not be able to recognise a concept by another name. Though sometimes they are very good at splitting concepts into their essences. It's after all how they work internally with all those tokens. They are made for processing language after all.