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This is just a gamer (who btw farms montages in low rated btb games) ranting about Trueskill2 based on an out of context paragraph that in context with the rest of the model of skill they are trying to approximate, your teammates' skill doesn't really affect your change to win/predicted stats in a given match.
If you want, they have talked about the actual algorithm that then attempts to match players based on their rating. https://www.youtube.com/watch?v=0FoG4Jtpebs
It biases towards matches it thinks will be a fair fight between both teams with bounds on the max skill diff between the best and worst players between both teams. And they adjust these bounds with player population throughout the day so you can get into matches quickly. https://www.microsoft.com/en-us/research/project/truematch/
(who btw farms montages in low rated btb games)
Typical, so many of the people who complain about the existence of SBMM in games are people who want to be able to constantly stomp players who are worse than them (when people complain about "not wanting to sweat all the time", this is pretty much guaranteed to be the actual reason)
While I don't doubt that Halo and CoD have flawed matchmaking, people usually use those to say that SBMM as a whole is a bad thing, or even that it's "ruining gaming", when it exists for good reasons and benefits a lot of games
You rarely see people complain about it in fighting games for example, usually when people do it's because the developers of a given game have designed an original system that does a bad job at actually matching skill, when a typical Elo-style system would've worked far better
It's just whining. Even communities of games where SBMM has always existed, people create wild myths like "loser's queue" to justify their inability to easily win. It's just a result of people having no sportsmanship to speak of.
I found a YouTube link in your comment. Here are links to the same video on alternative frontends that protect your privacy: