It's an interesting document, but I am unconvinced that data spikes mean environmental radiation driven data corruption. The fact that they have a certain pattern suggests it's not random.
They certainly do put a chapter with potential triggers down there, and it's a good take, you can't just discard the possibility. But above, they also have SW bugs as a potential trigger, so... Essentially, they don't know for sure yet.
> But above, they also have SW bugs as a potential trigger, so
They also did extensive tests and analyses and came to the conclusion that a bug was highly unlikely (they would never say that something is impossible, but it still is exceedingly improbable).
> Essentially, they don't know for sure yet.
That’s not a really fair assessment. Their conclusion is that they could not estimate the likelihood of a radiation effect, so in that sense they don’t know for sure. But they still eliminated a lot of options. Almost all of them, actually.