I suppose I agree with that. If he's taking out 90 million civilians that would be by far the most extreme action and this assumes people follow orders. He did recently purge a few generals.
Purge as in fired, not Xi-stinguished. I don't know to what end this would accomplish anything. A strong message to China? What would be the point in removing the cost burden of the Iranian government that is their civilians? Purge Muslims? There are something like 2 billion so it can't be that. What other reasons might there be? Untrained and inexperienced civilians offer little benefit to their existing IRGC that I can see. They are all soft targets and a cost to Iran's government.
He's bluffed in the past. Some call it taco, I call it a bluff. All entirely expected from a former real-estate empire builder.
T-minus 6 and a half hours.