I'd say it's a mistake that's common enough to be forgivable when made by the general public, but I doubt you'll find any grammatically reputable source that sa

I'd say it's a mistake that's common enough to be forgivable when made by the general public, but I doubt you'll find any grammatically reputable source that says it's not a mistake. The article gets it right elsewhere. (We're talking about "it could be bad timing for Amazon and it's new Kindle Fire HDX tablet", right?)