Bullcrap. If they were really a “nuclear state”, they would demonstrate it by a very public nuclear explosion.
a) Everyone on the planet knows that they have machines and materials for enrichment. It's not something they need to prove.
b) They still may do the explosion thing. Probably after they are slapped with another round of sanctions. They know what India and Pakistan did, and they will follow in their footsteps (explosion, sanctions, no sanctions, back to normal.)
c) Very likely they already have a bomb. It is too risky to taunt the world otherwise. The 20% sample was probably made months ahead of time - you can't just order to make it three days before a major celebration and be sure that nothing will go wrong. If they did that in advance, what else did they do?