There's a ton of Tesla customers who've experienced some variation of minor battery problems that turn into full replacements, this isn't a new issue. This poor guy hit some debris that broke a coolant hose connector into the battery pack which Tesla said destroyed the whole battery pack.

https://www.carscoops.com/2021/07/tesla-quoted-16000-for-a-r...

This is why quality matters and when Tesla fans dismiss obvious quality issues, this is what they're excusing. Water should not be getting anywhere near the top of the battery and if it does, it shouldn't destroying the entire battery.