And their Old Covenant won't save a single one of them from eternal Hell. So talking about the Old Covenant is merely academic.
The man you consider to be Pope says otherwise:
"We hold the Jєωιѕн people in special regard because their covenant with God has never been revoked." --
Evangelii GaudiumSo, is that part of the "ordinary magisterium," to be believed by the Faithful, or isn't it?