Ya... if you look at that person's post history, it looks as if that might have been a typo or something of the like... weird business.
USC was pretty clear that they hadn't made any kind of selection yet.
And someone else on this board believes that USC usually does interview, so it'll probably be invites to interview we'll be getting soon. (Hopefully!)
USC Roski's ph# is 213-740-2787 (ask for the grad office) if you want to ask them about it. They're a friendly bunch.
Oh, and,
"The Office of Admission provides official notification of admission decisions by mail only." So they tell me.