Poppycock. The President doesn’t ratify treaties, the Senate does.
They’re trying to put polka dots on an umbrella, they’re using administrative maneuvers that apply to the U.N only, so yes. They can make it so that Trump can’t change the deal the U.N has made among other nations, but that’s no story.
It doesn’t mean Trump has to adhere to it.
They can ponder all the sophomoric power plays they want, over at the UN. I suspect they will, however, have a lot less time for this foolishness as they will soon be looking for a NEW HOME. Without US support, financial and otherwise, the UN is just a Banana Republic tin pot dictator’s club. Good riddance!