In one of their email, it says "Typically, we are able to offer funding support to about one-half of those interested in our program."
more details ---
Funding for doctoral study is the number one question that accepted applicants have. Funding support for doctoral students in our department works through the Graduate Student Researcher (GSR) mechanism. The GSR is a university mechanism that provides a stipend, insurance, and tuition remission to a student in exchange for that student spending 20 hours per week working on a research project. All GSR positions are considered on a one-year basis (i.e. a funding support commitment for one year, with extensions granted on the basis of performance during the year).
Hope that helps!