I sure wish they would talk about the hardware. I spent a few years developing a radiation hardened fault tolerant computer back in the day. Adding redundancy at multiple levels was the usual solution. But there is another clever check on transient errors during process execution that we implemented that didn't involve any redundancy. Doesn't seem like they did anything like that. But can't tell since they don't mention the processor(s) they used.

One of the things I loved about the Shuttle is that all five computers were mounted not only in different locations but in different orientations in the shuttle. Providing some additional hardening against radiation by providing different cross sections to any incident event.