Technically Israel will neither confirm nor deny they possess nuclear weapons....
That doesn’t change the fact that they do have them. This “neither confirm or deny” was designed to give political cover to other nations who support Israel and actually helped them with their nuclear weapons. It’s merely a diplomatic maneuver on their part, nothing else. Everyone already knows without the least bit of doubt that they have nuclear weapons.
And I’m not even sure those submarines are classified as ‘ballistic missile submarines’ anyway.