Ah yeah, that line could, and should, be lot more clearer in the hindsight, as the trick is a bit too mean to the player. The line is meant to indicate that while you did use the kettle to get water, you never turned the kettle on, you know, to boil the water (or you kept too long and the water has gone cold lol).
Thank you for the feedback and playing the game! I'm glad you enjoyed it ^^