This matchmaking seriously needs to be fixed, what is going on?

'Match quality is as good or better than it was last season, ecks dee!!!!!!' How the fuck do you explain this Gold I and Platinum IV player in a game full of S8 Diamond players around Platinum I? Spoiler: The Gold I and Platinum IV player on my team were 100% dead weight and fed. They should not have been in this game, so why were they?
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