My guess is they would put fat into it to make sure you gain weight. I'll bet it'll work, just not exactly as the user would like. You'll gain weight, but not just in muscle. The weight gainers I've bought don't have that in them. Just cals, protein, and some creatine.
I guess you didn't know it has all the sugar to. That's pretty lame they'd pack that in to.
Saturated fat can kill you. That's all

There's a lot of saturated fat in animal meats. But they won't kill you so long as your not consuming only animal meat. They are the fats stay solid at room temperature (the white stuff left in the pan after cooking say...bacon). They are also in hydrogenated oils. Those plus Trans Fat every day, is looking to cut your life real short.
The saturated fat will increase cholesterol, (as is my understanding), and we all know what a poor cholesterol rating can cause. It's kinda hard to avoid saturated fat altogether, especially if you're on a weight gaining diet. I would just take some fish oil pills, Omega-3 pills, or something to counteract any drop in good cholesterol. I would do this anyways. Maybe somebody with some better info could help if my answer isn't good enough. I just know I try to avoid them altogether, because my family has some heart disease problems.
P.S Is that you in your avatar?