Update Custom Record

What the requesting user may do with the records of this Custom Record type — not with the type definition itself, which is an administrator permission and is not reported here. update and destroy describe whether the role has that ability anywhere in the type; for a specific record, use the permissions on the Custom Object itself, which accounts for row-level restrictions.

What the requesting user may do with this Custom Record type itself — adding a type, renaming one, or deleting one. This is an administrator permission, and is account-wide rather than per type: every type in the account reports the same answer. For what the user may do with the records of the type, use permissions.