Just a little uptight, are we? If you ask most people how big a football field is, they will probably say, “100 yards by 50 yards”. They will ignore the endzones and guess about the width, and arrive at an area that is about 3% larger than an acre. This isn’t “blatant innumeracy”, it’s an estimate used to help the reader visualize. I’m glad you had the chance to be absolutely correct at least once today, it’s just too bad it was that important to you...
LOL, friends with the author, are we?
We see blatant innumeracy in journalism continually, and excusing it doesn’t help the situation. And if it were a Jeopardy question, I assure you “What is 100 yards, Alex” would get you nothing for “The length of a football field.”