They aren't saying you is the problem. They're blaming it on Distilled Water and Killcoils. They did go out of their way to suggest that owners weren't intentionally abusing their blocks just using an inappropriate combination of anti microbials using Copper Sulphate which affected their blocks.
They're OBVIOUSLY wrong because there are no other manufacturers having this problem to my knowledge. But that's because their focus is only on their blocks. What they SHOULD have done was provide the Institute doing the research one of their blocks unopened and still in the package and a couple unopened competitor blocks and then do a blind study. This OBVIOUSLY wasn't done.
This kind of thing happens all the time regardless of the manufacturer. I do like how Corsair goes about it however. Don't question the people paying for your product because it could ruin you. You may be out now, but better that than the bread line.
In any case it's easy to see that EK doesn't have the experience dealing with widescale issues like this. This is a global issue, not just a geographical one. So it narrows it down quite a bit. Only they're seeing this as bigger than they can responsibly handle. If they do a blind study and direct their actions AFTER the results are in, they're better off in the long run.
I'll do Copper but not Nickel. I can't get my GPU block from them right now anyway cause they stopped making the Copper Black Acetal block for my GPU. I don't understand why they stopped production on that one and keep rolling blocks out for 2***, 3*** and 4*** series ATi cards but I can get along without that. I'm kind of worried about the MoBo block because the only other choice I have for the Formula Board costs €180 prior to shipping. So I'm kind of stuck for choices in Water Cooling.