This is the legal definition of Substantiate.
“To establish the existence or truth of a particular fact through the use of competent evidence; to verify.”
The church dragged out this man's claims until the statute of limitations was reached. The Grand Jury report scathingly chastised the archdiocese for hiding evidence, denying evidence, ignoring evidence and keeping pederast priests working with children.
This has been the pattern of the RCC for decades.
God willing, that pattern will be disrupted this time around.