Impossible Wardrobe?

When checking the Wardrobe on tile B2, it says if we have Card B we can get rid of the cockroach.

The only way to get Card B is to use the Candle Remote Control, which you get through the wardrobe and then close off the wardrobe as an action.

So, why does it say this as an option if it is an impossibility.

Because Card B is active until the dream ends, we never start a retry with it before the wardrobe gets locked.