Why is there a noob in my silver/ gold placements???

OKAY SO, I played my final placement for rank. We lost terribly because we lost all of top lane towers and inhib and even a nexus tower 16 mins in game. I check our top laners stats, HIS ACCOUNT IS LVL 34. Everyone in the game is like at least silver 2 last season and above lvl 70. So why is this lvl 34, experienced player in our ranked game. it was inevitably a loss from the start. I came here to ask WHY IS A PLAYER LIKE THIS IN MY GAME[](https://imgur.com/XqkzzEX)
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