Can someone help me understand this Curve tx?

I'm confused by this transaction. It looks like the price of BTC at this block was $31724 and the price of the curve token was $31869 (I got both of these prices by calling the YFI price oracle (0x83d95e0d5f402511db06817aff3f9ea88224b030) at block 12706429). However, it seems like despite these tokens being worth about the same this person was able to effectively exchange 10 of one for 272 of the other. Am I pulling incorrect price values?