Strongly disagree with this statement.
Nuclear weapons are incredibly complex. Splitting the atom isnt easy. My little brother is a nuclear engineer. He has no idea how to make a nuclear weapon. Has never met anyone who could...not his professors, his bosses, coworkers etc. Literally none. Ever. Not once. In fact, that work is so compartmentalized (for obvious reasons) that theres not 1 human being in this country that could build a nuclear device that would actually detonate. Thank God. Even trying to acquire the required equipment and parts would immediately be flagged by the FBI, CIA, probably Mossad and half the other intelligence agencies on Earth. We take that stuff super seriously.
Nevermind the fact that you cannot get your hands on "yellow cake" Uranium that is enriched to the 90%+ purity of weapons grade. Nor any other Uranium...of any grade. The Iranians probably got their Uranium from China or a former Soviet state...and have managed to admittedly achieve 60% purity on a large amount. That is 1 enrichment cycle away from weapons grade Uranium. Thats why they are getting their azzes handed to them right now. This has taken several decades and BILLIONS of dollars. It has also taken incredible levels of deception and secrecy, and cost them many lives in the process. It also required either China or Russia giving them supplies AND at least some of the technology to enrich. Yet they STILL don't have a weapon. Thankfully. They would absolutely nuke Israel right now if they had one. They have said as much.
It is absolutely not a foregone conclusion that any nation who wants a nuclear weapon can have one in 2025. There are lots of countries that want them, that dont have them now. Mostly the ones who hate us fwiw. We can, should, and will prevent anyone else from having nuclear weapons that we can...especially in our hemisphere. If China wants to arm their lesser neighbors like N Korea, there likely nothing we can do to prevent that. Good luck to anyone else trying to acquire that technology without US approval. We can detect even underground tests from halfway around the world.