Iran believes in martyrdom, which absolutely changes the reasoning. They would destroy Israel in a heartbeat even if it meant losing 90% of their population.
Don't confuse religious rhetoric with actual state behavior.
In Iran’s case the highest religious authority has repeatedly issued a fatwa declaring the use of nuclear weapons forbidden.
Pakistan’s army motto invokes jihad, yet it has treated its arsenal as a shield against invasion so far, not a ticket to paradise.
Israel’s so-called Samson Option evokes a biblical suicide attack, but I doubt they'll use nukes for anything but deterrent.
North Korean propaganda urges citizens to die for the Leader, and I'm sure there are other nations I've not listed who's dominant religions have some sort of martyrdom idea, which use nukes as deterrents.
Look at political interests, command structures, and the costs of escalation, not whether a nation honors death in battle (which one doesn't?)
I first read this as referring to Trump but I can't quite place the rest of the comment. Do you mean whoever is in charge of Iran or is it a way of saying both/either?
Supreme Leader (officially Supreme Leadership Authority) is the head of state of Iran, combining both political and religious ultimate power, appointed for life.