A few months ago I listened to a talk a General (Admiral?) gave at CSIS where he said that the US purposefully announced their drone-hellscape plan for a Taiwanese invasion in order to force the PLA to reconsider their options/success-likelihood. I wonder if something similar could be coming of this reporting, on the face it looks like an embarrassing fumble, but it implies:
a) the US is able to, and regularly is, tracking and analyzing the manifests of ships between Iran and China.
b) the US is ready and willing to interdict and board vessels even from the PLA.
That these facts are now public might deter the Chinese leadership from attempting to share nuclear tech with Iran or other countries in the future.