The main difference in how "Video Games Should Be Considered a Sport" and "Gamers Are Not Athletes" talk about video gamers as athletes is:
"Video Games Should Be Considered a Sport" thinks eSport gamers are athletes because of their strategies and quick reactions, but "Gamers Are Not Athletes" says they aren't athletes because they're not healthy and don't move around physically.
This response captures the essence of both articles, emphasizing the arguments in favor of viewing eSports as a legitimate sport versus the criticisms that question the athleticism and health aspects of video gamers.