sadly, this is not limited to gun journalism. Journalists are paid by the piece, so speed in creating them pays. To further cust costs, editing and proofreading (and, especially, fact-checking) have gone by the wayside.
Far, far too many journalists start with wiki, then a google to glean some pull quotes, and crank an article out. Could be on home schooling, could be about tax preparation, might even be about firearms. All grist to the same mill.
Now, there are some few, a dedicated few, who do care about their subject material, even to the point of becoming subject-matter knowledgeable. They are to be applauded.
Tricky part is recognizing the lesser ones when they opine on things you are not knowledgeable about. Which is why we can laugh about a proposed support weapon in the 6.5-7mm caliber range that is to 'hit as hard as a tank."