Sean Hannity is not a journalist. Like Tucker Carlson, he's legally classified as an opinions analyst. This means he can say whatever he wants without any accountability.
Unlike a news reporter that has to cite sources and retract inaccurate information, Sean Hannity can lie and never be held responsible.
The courts have decided that there is no public expectation that these people will tell the truth so they don't have to tell the truth. Only idiots believe their crap.
Unfortunately, there are lots of idiots.