It's not the water in the fuel (in parts per million) causing the probe to misread, it's the water pooling around the probe either causing corrosion, or as it's the lowest point in the tank, and water has a different capacitive value than fuel, causing misreading. This will happen on any capacitance type system.
If you carry out your fuel drains/checks and the same is said for your supplier then you shouldn't have this problem, which is the gist of the IN from ECD.
No doubt every pilot will claim to religiously carry out their fuel checks 100%, I call 'bull****'.
