As soon as the FBI got involved, they classified the attack as terroristic. If nothing else, it's worth expressing that the Louisiana mayor is the one claiming it is not a terrorist attack, not the federal government as is implied.
Thankfully Lemmy let's you edit your post, and it's completely in your power to add a text comment to this post explaining what happened. You've done your due diligence
The format of the date is somewhere around #9000 on my list of shit to worry about in real life.