I find it hard to believe that Popular Science would make such a mistake, but the author has reinforced the mistake by starting the article with “The dark side of the moon, despite its name, is a perfect vantage point for observing the universe.”
But all the quotes from scientists correctly say “far side of the moon”.
I know this isn’t really “science news” but I couldn’t find any other community to share this.
Well yes, it waxes and it wanes, but like so many people have already said, most people know what you mean when you say "the dark side of the moon".