Assistance implies active help. Something like old Clippy https://en.wikipedia.org/wiki/Office_Assistant
AI assistance sounds like you used such a helper. The disclosure questions do not even ask that. You could have gotten the plot for a game from a chatbot and it would not be covered by the disclosure. You could have used an ai assistant to playtest the game. And so on. The disclosure questions only ask about the final product. They want to know about the assets and code and that's what is filterable with the ai filters and the no-ai tag.
Therefore I disagree that this ai assintance term is simple, or accurate and precise. It is quite the opposite. It is misleading and vague.