I guess the parent was saying since there is no evidence, then it didn't happen. Almost sounding like a conspiracy, like the 30k death are fake. And you are simply saying, the Iranian Gov is blocking the information, that doesn't mean it didn't happen.
We have not been shown any evidence that shows anything approaching this scale of people dead, we have not been told on what basis that specific number of deaths was determined and we have not been told why that supposed evidence can not be made public. 30 thousand killed in the span of two days would make this one of the bloodiest massacres in history. I don't see how that would not result in at least a single photo or satellite image of a street lined with dead bodies, of mass executions, of mass graves or simply just the logistics operation required to dispose of this many bodies. The only thing to back up this number is trusting the probably least trustworthy US administration in history.
During Covid, there were satellite pictures of mass graves. There is a certain amount of logistics with moving a lot of dead bodies, that is hard to hide.