Once you open the nuclear genie, it's not going back into the shell. If Israel resorted to nukes, it will get nuked back. How many nukes do you think they can take? Claiming they have a higher chance to survival a nuclear conflict is quite foolish to say the least. They're far too small.
It's not completely off-topic. The purpose of the Fatteh missile is just this.
The topic is Fattah hypersonic missiles and you're talking about nuclear conflict with Israel, need more clarification?