Popseco1, What you're seeing is a list that came from Steam. Someone with graphics design made a convincing alteration that is to purposely fool people into believing that theirs a Summerset DLC out there. It's all but fake.
Never trust a screenshot. Example below:
This took me all of 15 seconds to do. EDIT:Oh noes, I missed a button when I print screened and you can see my taskbars. Of course, when properly faking, you would print screen properly or crop at least.
Geeze you got a lot of icons! I am afraid to see what your desktop looks like.