I'm not sure. But I wanted to add this here for future reference. I think it's not necessarily a statement of guilt made purposely by a person... but a statement a person has made that makes someone else think they have some degree of guilt.
Here's something from "Inculpatory Law and Legal Definition /
Inculpatory Law and Legal Definition | USLegal, Inc.
"For example,
inculpatory statement is a
statement which attribute liability on the person making such
statement. It incriminates or places guilt or responsibility on someone. Likewise,
inculpatory evidence is evidence that establish the guilt of an accused. It indicates that a defendant committed a crime."
(Areas that were bolded were already bolded... not bolded by me)