Why am I matched with a Gold 2 in my Diamond 4 promo?

Title. Was playing a flex with my friends, we were 3, we're around low diamond/very high plat elo AND MMR and I was in promo to d4. But I was matched with a gold 2 (flex rank) Draven who ended the game 0 9 3. Can someone explain this bullshit? Seriously, a league and three divisions lower than me? What the fuck?
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