The quantity doesn't seem right to me, a normal american peanut butter jar is about 2 pounds. I feel like if the only thing you eat in a day is peanut butter that by itself would be about a half a jar right? Calories would put it at ~1/3 a jar for daily caloric intake but obviously you're going to overshoot if you're eating straight peanut butter. Half a jar in a week just doesn't sound that crazy to me, thats barely over 2 servings/day.

Also peanuts are low in oxalates compared to other nuts. The number I keep finding for a low oxalate diet is 100 mg/day. Apparently 200-300 is a typical amount. The highest number I found is 20mg of oxalate to a tablespoon of PB so 2 pounds a week is only 160mg/day unless I messed up the math.

*I think what happened here is OP is either predisposed to kidney stones and is generalizing the special diet they should be on to everybody else or is just overweight and leaving out that detail since everything I'm reading about NAFLD is that it's caused by obesity not oxalates.