Quote:
Then, before transporting the reporter back, Atom Man has Jimmy blindfolded to keep the hideout's location a secret

And when Jimmy gets to the office he tells Clark and Lois, "If I didn't know Luthor was in jail I'd swear he was the guy who calls himself The Atom Man". So Jimmy can recognize Luthor even though he's wearing a full-head metal mask and speaking in an echoey voice with a fake accent, but he can't recognize Superman who's standing right in front of him wearing a pair of glasses.