I doubt that. Their starting 99.9 lethality rate seems way too high for the radiation dose used. But... the sensitivity variance may be very large.
I can't believe any of their numbers. They started off by killing nearly all(how can they determine that before the fact?)of the bacteria with a dose one hundredth of the lethal dose for humans. They improved it by a factor of 50 after 44 trials. That means that they achieved a kill of nearly all the bacteria while still only using 50% of the dose needed to kill a human(whatever that means, MLD is a clear standard). See my post 6 for the fact that E.Coli resistance is 1000 times greater that human resistance by the numbers of my unattributed citation.