The Iranian spokesperson did not mention Pakistan. Nor did he confirm the reports about outside intervention, he only said these claims are going to be investigated.
It would appear that Iran had preferred the Panjshir issue to be solved through negotiations rather than through force, similar to Herat for instance, where the Taliban and Ismail Khan reached an agreement and bloodshed was avoided. And so Tehran expressed its point of view through the spokesman's commentary.
I honestly don't see what the big deal is here... It's simply a differing stance on a specific case where Iran might feel the Taliban did not quite act the way they had told Iran they would. But I very much doubt that this will suffice to make Iran revise its overall policy towards Afghanistan.
If this model of confronting domestic political competitors (some of whom are close to Iran) is generalized however, or if the Taliban proceed to opting for an outright anti-Iranian line under the influence of the US and its regional clients, then things may change. Absent these sorts of developments however, Iran is unlikely to modify its basic approach on the Taliban.