This is kind of the point. We simply don't have a sufficiently good understanding of food and nutrition to be able to say "smoosh these nutrients ands other food derivatives together and you get a healthy food".

UPFs is exactly the smooshing, and is generally done to maintain palatability whilst saving money, not even in an attempt to make a healthy food. Sure, Huel has a different goal, but I'm not sure the end result is any different. Just because it's not hyper palatable, it doesn't mean it's healthy.