I don't know rad hard semiconductor processes either but it is true that space probes are SEVERAL generations behind in semiconductor tech. The cited article referred to ASICs which are Application Specific ICs. That means that the designer arranges the gates, RAMs, ROMs and flip-flops (storage elements) specificly on that chip to accomplish a specialized goal. That blank ASIC can be made into a number of differing designs. Designing and qualifying each individual ASIC design in the commercial sector costs around $1M. Commercially folks use FPGAs (Field Programmable Gate Arrays) which cost a few bucks more individually but are readily reprogrammable upon error unlike expensive ASICs which are saved for high volume low cost applications.

In the processor realm I think Intel finally rad qualified the first (oldest & earliest) Pentium processor in 2003. It's expensive and consumes design resources that are more profitably utilized in the competitive commercial market.