I agree with the point you are making, but those numbers are not directly comparable. Catholic schools in NYC are heavily underwritten by their local parishes and secondarily by the archdiocese, and they also have non-trivial funding from a variety of government programs for providing social services.
Beyond that, there are fewer and fewer parish Catholic schools in NYC. (The parish schools have much lower rates. There are also independent Catholic schools (ones run by boards rather than the archdiocese directly) that charge tuitions in the 25,000-35,000 range. Those aren't closing down so quickly.)
