That position is close to impossible in most games. Technically it’s a “possibility” but, that is ridiculous. The side with the queen would have to be a complete ignoramus to find themselves in that position. If they’re that dumb, how did they end up that far ahead in material in the first place?
The clear demarcation at possible (versus plausible) avoids arbiters having to use their own analytical abilities to make a ruling. It is the same reason the existence of any pawn on the unflagged player is considered enough material to get the win.
That position is close to impossible in most games. Technically it’s a “possibility” but, that is ridiculous. The side with the queen would have to be a complete ignoramus to find themselves in that position. If they’re that dumb, how did they end up that far ahead in material in the first place?