To answer your question non alcoholic fatty liver is associated with over consumption of carbs. There have been numerous anecdotal accounts (believe them or not) of people having their liver enzymes improve and return to normal on keto or LC.
One thing keto has tuned me into is the protruding liver most middle aged people have. Even thin people will have a bulge above their waist in the middle. While mine is not perfect, about 2 months into keto I noticed that this bulge went away mostly. I am not a big blood tester so I have nothing to back up.
I agree that we have a bias just as the vegans and low fat camp have a bias but my liver is not something I worry about on keto. I am sure there is plenty to critize in keto studies if you look hard enough. Plus Atkins did not have an autopsy the way Pritikin did.
So I do wonder but as the months have gone by, I wonder less. I am not sure why, confirmation bias? I have no idea