You've got some points on regeneration, but notice I wrote strong radiation. For weak radiation the issue is complicated, the effects develop over decades. Of course LNT model is under legitimate suspicion due to regenerative capabilities but LNT model is just about probability of cancer. It does not take into account other effects of radiation. The survivors of Chernobyl suffer different harms, for example one interview I read recently reported one survivor of high doses having to go for regular skin transplants. The radiation health effects are complex and the whole issue is just far more complicated than the Forbes biased opinion piece claims (although it does make a good point of taking the immediate death toll in perspective).