Science has methodologies. Science asks others to replicate results, to review what has been said, to try to add more information to the puzzle. The French Academy of Sciences is unlikely to simply forge data to make it seem as if small dose radiation is okay, since very likely the subject will be followed up upon by others. They’d ruin their scientific reputation and if anything cast more negative publicity on nuclear and radiation issues.
Besides that, it doesn’t even make sense. They’re not saying “hey, turns out radiation is good for you, so every tuesday let’s let our reactors run unshielded” or even just “hey, no big deal if a core melts down” or something. If there’s a radioactivity hormesis effect, if it were ever used for treatment it would be with specialized devices that very carefully controlled it, so it has no bearing on France’s stance on nuclear power.
He’s right to essentially call you a conspiracy theorist - what you’re proposing goes against what you’d expect an organization of that type to do, they’d quickly be rebuked by other scientific authorities, and it doesn’t even have anything to do with nuclear power. But you’re proposing a radiation propoganda conspiracy from respected scientific institutions because hey, France likes nuclear power. Yep, it’s the Nuclear Establishment brainwashing us. Der Trihs was right to dismiss you as he did.