In the absence of any additional corroboration, I have reason to treat this with extreme caution.
Let's get some perspective on this narrative which has gone viral in the last day or so and acquired a life of its own. The authors of this narrative are Larry Johnson and Pepe Escobar. Both reputable actors whose credentials go back decades when they first challenged the lies of Dubya/Cheney on GWOT and especially the Iraq debacle. Both of them emphasize that their reporting is based on a SINGLE source in Pakistan who is high enough in the hierarchy (ISI ?? Army CoS?? PMO??) to be credible for them. That Iran has the CAPABILITY is generally accepted by most experts (eg MIT Prof Ted Postel)
But the single most critical challenge that comes to my mind is WHY? And WHY NOW?? It would be fool-hardy for Iranian leadership in the current phase of the war , when they have the upper hand in the SoH, to give up their high moral standing in the eyes of the world. And for no conceivable gain.
I remain, however, to be persuaded.