Well this video came out recently:
And Iran was seen adding HAS infrastructure for future large jets before the war. Add in the fact they also purchased YAK-130 and Russian attack helicopters and Russian humvees in recent months, it’s likely what they are alluding to is a Russian SU-30 license production like India has.
Time will tell. But one thing I know for certain is Iran isn’t developing its own fighter jet. It neither has the infrastructure (even pre-war) nor the resources for such an endeavor.
It’s best bet is to secure SU-30/35 in short term along side a small number of SU-57 and be a part of the SU-75 checkmate program for a future fighter jet to replace the bulk of Iran’s aging jets that still remain. SU-35 can only be a stop gap, not the future.
The odds of China selling fighter jets or license production to Iran is near zero. Xi is worse than Putin when it comes to such matters.