If I were him, and I were working on developing nukes, I'd want to stay the American's hand as long as possible. So, since there wouldn't be much I could do to convince them that I wasn't working on a bomb, I'd try to trick them into thinking that I wasn't nearly as far along as I actually was.
I believe that there's a definite non-zero risk here that he began enriching uranium and completed his 4,000 centrifuge machines a long time ago, and is busy producing bombs right now as fast as he can.
But the Americans may have bought the big lie and believed that he only has a measly 164 centrifuges. So they won't attack just yet, giving him another few weeks or months to build even more bombs.
I just don't see why we're willing to take that risk. We can't take that risk. Good God... The lives that are at stake! We should attack. No fooling, we should attack right now. imho