Aside from clearly being a smart investigative reporter, or intern at least, and no one questioning Clark’s absence in the T-Craft. Clark says their first date was 3 months ago while cooking dinner breakfast (conveniently the only period skipped in the intro timeline), and presumably Lois is dating Clark, not having ice cream and seeing movies with Superman. AND then Jimmy straight-faced says at the end Lois and Superman have been hooking up for 3 months. Jimmy knew the entire time.
I wish we got more of Clark in his daily life.
I felt like everybody he works with probably knows, they just play along cause they know his identity can’t get out.