I believe it. They’re primarily using missiles that take a predictable, ballistic arc, which makes them very easy for the Iron dome system to intercept. Furthermore, Iran’s responses so far have seemed very carefully measured so that only a few missiles get through the iron dome. Based on previous strikes, it seems like they could overwhelm Israel just through sheer numbers, yet they haven’t.
Here’s a decent article on this:
Israel has the US in its pocket, meanwhile there are plenty of hawks in the US who would love to go after Iran so there’s a huge imbalance. Iranian military responses are carefully choreographed to show defiance and stop short of escalation whilst Israel is running around doing whatever the hell it wants and ignoring the US.