If they decide to go down this path, someone in Australia will report them to the ACCC. If they are using it as an excuse to avoid their warranty obligations, then they will be sorry.
No, what I’m saying is that if they claim water damage based on those indicators alone, and they do it as a policy, then the ACCC will likely consider it a policy to avoid warranty claims.
If there is genuine water damage, of course that’s not warranty. It’s how they assess it that could be problematic.