The fact that you feel like you have to point this out just shows how you're missing the point that nobody cares. Yes, it is a silly mistake to make, but it doesn't negate the intent of the sentence. Harping on it just as a take down comment on a post is just immature.

If this was a post or even just a thread on the lack of editorial process with in today's online media, then we could nitpick the use (or not) of the Oxford comma, the emdash vs endash vs hyphon vs ellipses vs parantheticals. We could even pontificate on the grammar like the selected sentence structure, use of single long sentence as an entire paragraph, the use of capitalization of all the letters or just the first letter in an acronym for a name like Nasa vs NASA. Alas, that's not what this is, so there's a saying that comes to mind about time and place or even picking your battles.