You'll get no argument from me. Of course, if they did so, the U.S. Conference of Catholic Bishops couldn't boast of having the largest body of Christians in the United States any longer.
Roman Catholics total 64 million in U.S. ["counting Catholics is really more art than science"]
I found the statement of people failing to report deaths to the Church in that article somewhat interesting. If people aren’t going to a Catholic Priest for last rites & their family members don’t have a Priest involved in the burial, it would be hard to argue that the dead individual or their family was Catholic.