Match making kinda broke in this game?

Hello everyone, I'm kinda confused with match making these days. Is it possible to get an explanation from a riot member about the case mention in the link I added to this post. How is it possible to get a 5 man pre-made game in ranked flex with an average tier of diamond 4 is queued against a 3 man premade team with an average tier of plat 2/3 ? I can accept that it is possible to have higher tier members against each other, but 5 man pre-made full tier up above the enemy without a 5 man pre-made? That is just a wrong algorithm / poor matchmaking. Thanks for reading and I hope to get an answer from riot games developers themselves! KR Bobbayunga
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