They mentioned that on the national news as well last night, NBC. They also said he was fired and had a history of issues and it wasn’t the first time the employee mistook a practice drill for a real emergency. Sounds like the whole process was pretty FUBAR. You can read more here:
https://www.nbcnews.com/news/us-news/worker-who-sent-hawaii-missile-false-alarm-believed-threat-was-n842666
I find it “interesting” how much the current story differs from the excuse making originally fed to us.