Supposedly the study already accounted for that (amount and quality of food eaten).

Satiety is helpful in managing the "calories in" half of weight loss, but it's not an absolute must. Knowing when it's safe to ignore hunger and doing so when you've already used up you're caloric budget for the day is a huge part of successful weight loss. Basically same spiel with the "calories out" end. Working out can be fun (which is helpful because it makes you want to do it), but a lot of times it's not - but if you want to lose weight, you do it anyway.