Welcome to the wonderful world of discrimination. Many people suspect this was an "anti-otaku" law, so don't be surprised that it would adversely affect anime, manga, and video games.
However, the article is a repost of a Sankaku article, and Sankaku Complex is known for being highly sensationalist on matters such as these. My limited research just tells me that the "banned" video games will still be sold, just that they will be restricted to 18+ (so no sales to minors). However, many companies don't like their products being restricted as such, so expect more censorship to prevent them from being "banned".