My thermometer says it's -5, yet water is liquid. To be more precise, covered with thin ice. And covered with (thicker) ice it shall stay all the way to -20 probably. Whatever technical correctness you throw doesn't matter to common sense logic.

And that is even if there is a technical possibility to lower the temperature of every water molecule to -0.0001 simultaneously and demonstrate that it instantly freezes the entire volume in an instant. It'd be irrelevant since none of us live in that lab.