She didn't state only her husband saw him. She stated her husband saw him. Which is how it happened. Her husband saw him, pointed him out to her, and then later called her to see if she could still see the man and if so, call 911.
No one said to her at that time, did you also see him?
I think sometimes we read so much into what someone omits to say, or says in an odd way, when it's just a manner of speech for her. Like, maybe she thought it lent credibility to say her husband saw this, and wasn't really given time by the reporter to say I also saw him out the window.
Her husband was outdoors, watched him for awhile, and then pointed him out to her after believing he was odd. We all, starved for details, all decided that only he had seen the man because she hadn't flushed out all the details.