No they haven’t. Did you even read what that treaty is about? Countries that already have nuclear weapons get to keep having nuclear weapons, and countries that don’t have nuclear weapons will agree not to develop them in exchange for receiving peaceful nuclear technology. Aside from that, countries must “pursue” disarmament, but the treaty does not actually require it to happen.

Given the recent stirrings of Russia, and our proximity to their main path to the Atlantic (where most of the world’s undersea internet fibres are), disarming would be incredibly foolish.