Because they're not meant to damage. They're just meant to appease the Iranian people.
Iran doesn't want to respond to Israel. There can be two main reasons.
1. Iran is scared of US/Israel and knows that they can very well lose their country (there are so many minority groups and sections of Iran that will fight Iran for independence if they were to get full backing from legit allies. Iran is scared Israel and the US will support and arm these groups to fight Iran from the inside while the US/Israel fight Iran from the outside)
2. Iran is actually really close to being able to produce nuclear weapons, and they don't want the full weight of the US and Israeli attacks to undo their work.
Either way, whatever the reason, Iran will send a bunch of slow moving drones and missiles that are meant to be intercepted and maybe a handful of hypersonic missiles that get through just to show they can. And call it a day.
That's why they said all that to media. Cause it's for their own people to feel like they not pussies and not to actually damage Israel in anyway.
