I don’t know how that would be possible. Does he posit some mechanism by which the liver’s taking fatty acids, turning them into ketone bodies, and making them available to the organs that want them could cause fat to get stored in the liver? I would have expected fat to be cleared from the liver, not stored, in the absence of insulin and fructose. At the very least, I would like to see the study on which he bases that assertion.
ETA: Omar, since it is possible to be thin and still have fatty liver disease, I don’t believe it is possible to tell whether people have it just by looking at them. I think a doctor would need to run a liver enzyme test. In any case, liver fat can be cleared by eating a well-formulated ketogenic diet.