I think its very bad advice to tell them that they should disregard anything that they receive.
It is my understanding that if the under 21 year old applies for any kind of state benefits in NY (Medicaid, food stamps etc) that the state will force the issue of filing for child support. They should not win the case, but if the state is involved and they ignore all correspondence, they could end up with a default ruling. They would need to challenge NY having any jurisdiction to order child support.

