The main difference in how the two sources describe video gamers as athletes is:
"Video Gaming 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 captures the contrasting perspectives on whether the mental and tactical elements of gaming qualify players as athletes, versus the focus on physical fitness and health in traditional sports.