It has been found that most cholesterol in food just passes straight through you, most of the cholesterol outside your digestive tract is produced (by your liver IIRC) as a product of working on other things like large fat molecules.
People used to think that cholesterol directly in food was the big bad here because the sorts of foods with high cholesterol also tend to be high in the stuff the body uses to make its own meaning there was a significant correlation.
Silly high cholesterol in your diet is probably still bad, but very low is likely fine (as long as you have the right balance of everything else, of course).
This does mean that I have trouble trusting something like Soylent though: as we are still finding surprises like this because we don't fully understand how our bodies process nutrients, we can't be sure that a food replacement product like this is as healthy as intended and not potentially causing new problems. It is an interesting experiment to watch as an outsider though. I wonder if any independent researchers are yet doing well run long term comparative analysis on people using this stuff compared to other replacements and more "normal" diets? People are willingly taking it, so you don't have the ethics comity problem of convincing people to let you feed the stuff to humans as they are already feeing it to themselves and you are just watching the results.