Quote Quoting johnsamashin
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I see, thanks for explaining. So the onus is on the landlord to prove the guilt of the tenant. That makes sense.

I am surprised that the valve is a non-issue as only the toilet clog is the proximate cause. If the toilet were clogged but the valve was functioning properly, there wouldn't be any flood.
The valve is an issue. if it were working properly there may not have been a flood either as the overflow would've happened immediately and potentially caught prior to overflowing or the quantity of the overflow would've been limited by the valve. Yes, you require the clog in either situation but the leaking fill valve in the tank is most certainly an issue. If the landlord cannot prove that the clog came from negligent use then the landlord on the hook.