The basis for the inspectors complaint is, in large part, not that the plant is not capable of withstanding the quake, nor that the analsyis is faulty or incorrect, but rather that the licensing basis document has not been revised to require a higher peak acceleration design level. It is debateable whether such a would make any difference, since they are already required to analyze for the higher levels. Meanwhile, the concern is being handled through the appropriate processes.
I agree with your conclusion however I took away a different interpretation from TFA: the Hosgri fault was discovered during construction and not properly accounted for in the first place- making the comparison of the Shoreline fault to the Hosgri fault data questionable.
"Peck wrote that after officials learned of the Hosgri fault's potential shaking power, the NRC never changed the requirements for the structural strength of many systems and components in the plant."