

It would depend on the rock type, but I have the same opinion basically (I’m not a geologist or explosives expert, of course) - there is not enough data to claim destruction.
Places about 100 m deep (e.g. metro station Arsenalnaya in Kyiv) have been so far considered totally secure from conventional weapons. Of course, MOP is a big special purpose weapon, so the old truth might no longer apply… but I’m not convinced that Fordo is ruined.
It’s not politically and psychologiclaly realistic for Iran to return to negotiations.
At this time, they perceive themselves to have been attacked without provocation - basically because Netanyahu needed a small victorious war - and resistance is not something one negotiates about.
Also, the ayatollah is an authoritarian ruler. Negotiation would be perceived as a sign of weakness by the opposition and population - and he might be ousted. He knows this, so he will continue the war.