That’s like saying there is no “law” in the Declaration of Independence. Such an assumption would assume that there is no legal “Right of the People to alter or abolish” a tyrannywhich is what the USA was founded upon doing.
Saying the Preamble is not law is NOTHING like saying the Declaration of Independence is not law, for the very simple reason that the Declaration of Independence IS law, while the Preamble is NOT law.