Let me see if I understand this: I put 10 bitcoin into this bank, and it gets loaned to you. If you cash it out to 10 bucks immediately, and bitcoin later drops

Let me see if I understand this: I put 10 bitcoin into this bank, and it gets loaned to you. If you cash it out to 10 bucks immediately, and bitcoin later drops to half a buck, you can buy 10 bitcoin, pay back the loan and keep 5 bucks, right? Not including whatever interest, I guess. So this is a way to short bitcoin? Edit: Sorry, maybe just to short Celsius' own tokens, although maybe it's indirectly shorting other currencies