Er, the article is clearly about "participatory games" (either single-player games with leaderboards, or multi-player games intended to be played with friends or family-members rather than strangers) and how they should work vis-a-vis accessibility considerations, like "assist modes." Should a speedrun of a game appear on a leaderboard if you had to play with aim-assist due to Parkinson's? Etc.

If there's an ELO matchmaking system in place, then the whole discussion—"How to play with people who are better than you"—is moot. So, for the purposes of discussion here, you should probably assume that there isn't such a system in place for the game in question. (The people who are bringing up examples from games with ELO presumably haven't read the article.)