If that was true, obviously they would have built one buy now. Being one year away from building would be non-urgency inducing.
The constant lying about timelines does not imply Iran does not enrich uranium, but, as you remember, after the last bombing the leaders of the USA and Israel said they had completely obliterated Iran's nuclear program. Except, apparently After six months they are one week away from a nuke again.
This seems to indicate the USA should be bombing Iran every few weeks, forever, just in case they get a bit faster next time.
Except, when we don't have any scandal or other crisis going on, then Iran does not seem to be getting a nuke quickly. I wonder why.
Reread your parent comment, the concept of a threshold nuclear state is that they are constantly a month away, for years. That's the entire point, being effectively a nuclear state without holding a nuclear weapon
The problem I have with this doctrine is that if it's supposed to deter an opponent who already has a nuclear deterrent, they may decide their deterrent is not so deterring anymore and actively go and use it against you.
The whole idea of nuclear deterrence relies on all parties being rational and sensible about nuclear weapons use, but I don't see a lot of rationality in the current eventuality.