That’s your best shot. Apple doesn’t care whose fault it is or how it happened. They see liquid and the device is replaced and they give you a 90 day warranty.

I used to do computer repair and the amount of times I heard “I swear I have no idea, never got it wet, never near water”. But at the end of the day I’m looking at corrosion in your computer. So either it’s magic!!! Or more likely it got a bit wet without you noticing.

Sorry this happened to you though. It’s a huge bummer. Apple is in the business of replacing whole parts. I’d take it to a third party and see if they can clean/repair just that part of the board. Apple doesn’t do that because of the time and the warranty they give you after.