Re:No confirmation from Cassini (Score 2, Interesting)

I believe the seasonal variation in measured decay rates is likely to be a mundane explanation, but I also believe that the evidence from RTG power output in the article you linked is too indirect to prove or disprove the hypothesis. The author goes into a lot of detail to model the RTG thermal efficiency but the variations in decay rates in the attached figure were on the same order as his estimated error in the RTG model. Conceptually, it seems like this is an experiment that can be repeated with a good Geiger counter on a cheap satellite without relying on indirect measurements.