I can't help but feel like after this long, no sane person would still be proclaiming innocence if it wasn't true at all.
Of course if you think that only people who have protested this long were innocent then surely it makes sense for a guilty person to keep denying until the ends of the earth. In the end it's hard to tell using this sort of metric if someone is guilty or not. Sometimes liars will deny it until they're blue in the face, and sometimes innocent people will give up early when they feel there is no chance of people believing them.
I'm much to lazy to do the math. Let's round up - 4k errors per year has to be a vanishingly small percentage for a system that is up 24/7/365, or 5 nines. The fact that these DIMMs were "stressed" makes me wonder about the validity of the test. Heat stress, among other things, will multiply errors far beyond what you will see in normal service.
Except it depends on how the modules were originally tested. The study is saying that they break more than previously thought, rather than they break a lot. If they were originally tested in a stressed system similar to Googles and Google is finding that they have far more errors than they should then their study is still valid.
Never trust anyone who says money is no object.