In case they try to argue this wasn’t a treaty, and thus absolutely barred to states, the next paragraph, last sentence says states shall not enter “any agreement or compact” ... with any foreign power without consent of Congress or in such imminent danger as will not admit of delay. So either the world will end in a week without this or they have to ask Congress and get permission even if it isn’t a treaty. Even the 9th circus can’t save this.
basically it’s just symbolic- they aren’t going to sign any agreement or pact- but they WILL force their state to ‘observe the draconian rules and regulations’ of the original paris climate treaty- technically they can say they aren’t in the agreement when in actuality and for all intents and purposes, they are- NY Washington i believe, and a few other states are going to do the same damn thing- they and their lawyers WILL find a way to enforce the regulations without actually being in the agreement