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.
Well, it is kind of relevant if people at the Bugle know, but play along and keep his secret anyway. It means they’re not idiots, and actually want to protect him. And there’s no way Jimmy not batting an eye at the end wasn’t intentionally telling.
And concerning his identity, I think one of the themes was moving the emphasis from Super to Man. He’s an imperfect and real person with emotions, he genuinely loves pop punk, and when he blows everyone out of a black hole, it makes his mouth all numb. Plus, he’s got a dog, come on. I like the idea that Clark is less his secret identity, and Superman is more his public identity. But he was raised as Clark.