This is a tricky question that I don’t think anyone can answer definitively for you as so much is still unknown in this area.
You might find this paper from 2013 useful, it analyzes a bunch of studies that have been done regarding NAFLD. The main recommendations are 1. limit total calories (either low carb or low fat diets, it didn’t find that all fats were problematic) 2. limit fructose 3. limit trans fats and saturated fat.
Soylent is great for #1 and #3, #2 is IMO a bit debatable because of isomatulose in soylent which gets broken down into half fructose. I think we decided in another thread that it’s something like the equivalent of 3 cups of sliced apples. Is that more than someone with NAFLD should eat? I have no idea.
One thing you could do if you’re able to, is get blood work done every few months to measure changes in liver function. Then you could try a high Soylent diet for a few months and see if it changes anything.
EDIT: to elaborate a little, it seems that cutting total calories (particularly if you’re overweight) is by far the most important thing, and exercise helps too. If you find it difficult to keep track of total calories, the benefit of being able to keep to an exact number of calories on Soylent probably outweighs the downside of a bit of fructose that you could otherwise avoid (but again, I can’t say for sure).