"Supposedly" is false. The sun doesn't produce cosmic ray-power particles and soft errors aren't affected by sunspot activity. It is affected by altitude and space weather, but not solar activity.

https://en.wikipedia.org/wiki/Soft_error

I was in the audience of the talk. All devices should be required to use ECC because it's a security risk. Not as much as http:// era, but silent corruption across networks and systems is a thing.