One minor detail - they are tweaking the normal DNA repair mechanism that normally would respond to DNA damaged caused by radiation. What they are doing is suppressing the programmed cell death pathways that get triggered by unrepairable damage and possible even basic DNA repair.
The net result is that, sure, you live through the radiation exposure for the moment, but you've accumulated DNA damage that may or may not ever get repaired. So you set yourself up for a very nasty cancer risk later on.
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No risk can ever be zero. Ever. And space flight will never be as safe as everyday activities, ever.
The net result is that, sure, you live through the radiation exposure for the moment, but you've accumulated DNA damage that may or may not ever get repaired. So you set yourself up for a very nasty cancer risk later on.