Yes, a doctrine concerning civil immunity so long as the religious activities do not threaten the rights of citizens, the public morality, or a genuine public peace - that is, so long as the common good is not threatened. A determination of this is to be based on the objective moral order as interpreted by the Church (DH 7), since the state is to have the Catholic Church of Christ as her established religion (DH 1).
Of course, almost all false religions threaten public morality. And this right to be tolerated applies only to monotheistic religions - polytheists have no rights at all under the Declaration: "Provided the just demands of public order [common good] are observed, religious communities rightfully claim freedom in order that they may ... honor the Supreme Being in public worship" (DH 4).
In no way does the Declaration repeal the traditional doctrine that "that which does not correspond to truth or to the norm of morality objectively has no right to exist, to be spread or to be activated".