Don't get me wrong, Katz is a douchebag, but this was specifically a threat to retaliate in-kind of Iran continued to target arbitrary Israeli population centers.
I haven't seen any evidence of Israel targeting civilians (nuclear scientists aside), despite having complete air supremacy over Tehran. Air supremacy means Israel could carpet bomb the city if they wanted, but they don't want this. Not only would it be a horrible thing to do and of no military value, they simply don't blame the people of Iran for the IRGC's actions.
