that’s literally the implication of this right?

no. These people have no legislative power. Their only job is to appoint the SL or depose him if he isn’t doing a good job. They are respected but they have no power to enforce their will in this area.

They have no authority on nuclear questions one way or the other. The SL has the call on nukes but he can’t instruct the military to build a nuke while they are part of the NPT because the Iranian constitution says that Treaties must be agreed by the legislative assembly and the NPT is a treaty.

This is the Assembly of Experts saying that the NPT is a dead letter and being part of such a corrupt organization is pointless and it is a thinly veiled accusation of treachery on the part of some politicians. Saying it publicly is likely meant to draw out popular support in the streets to put pressure on the legislative branch of the government.

It sounds like there’s a process to it and the Assembly of Experts can’t make the decision on their own:

We hope that the relevant authorities will heed this demand under the wise guidance of the Leader.

But given their recommendation and the situation there as a whole, it does seem likely that’s the direction it’s going in.

Exactly - any announcement regarding the NPT gives the imperialists potential precedent for aggression against Iran, so Iran needs to maneuver their diplomacy to reflect their current concrete position in the conflict. Currently holding a large advantage allows them breathing room to make these public announcements. Further, the revamping of testing sites and lifting of missile range limitations are concrete preparations towards NPT withdrawal - Iran wouldn’t want to withdraw prior to developing the means of actually imposing their nuclear strength to the degree required to ensure complete sovereignty from aggression.