It read to me more like they were reacting instinctively, not professionally. Remember, if the Plutonian is anything like the actual Superman, his secret ID would have been a topic of discussion for YEARS - he himself makes news every time he appears in public, so learning something this intimate about him is something like going into shock. They'd be going 'He's WHO? Oh holy CRAP, we have to get this out, nownownow before we learn it's a hoax or something, this is NEWS!' I think the bigger issue is that, as his coworkers, they didn't have more respect for his discretion - I think, as reporters, they were fairly in character. Oh, and incidentally, I worked in the news department of a radio station once, and nothing about this particularly read false to me.