I thought the bishop of a diocese still had sayso over what orders were allowed within the boundaries of his diocese?
Two exceptions are the Society of Jesus and Opus Dei.
116. We have the duty, as Bishops, to be vigilant that the word of God is faithfully taught. My Brothers in the Episcopate, it is part of our pastoral ministry to see to it that this moral teaching is faithfully handed down and to have recourse to appropriate measures to ensure that the faithful are guarded from every doctrine and theory contrary to it. In carrying out this task we are all assisted by theologians; even so, theological opinions constitute neither the rule nor the norm of our teaching. Its authority is derived, by the assistance of the Holy Spirit and in communion cum Petro et sub Petro, from our fidelity to the Catholic faith which comes from the Apostles. As Bishops, we have the grave obligation to be personally vigilant that the "sound doctrine" (1 Tim 1:10) of faith and morals is taught in our Dioceses.
A particular responsibility is incumbent upon Bishops with regard to Catholic institutions. Whether these are agencies for the pastoral care of the family or for social work, or institutions dedicated to teaching or health care, Bishops can canonically erect and recognize these structures and delegate certain responsibilities to them. Nevertheless, Bishops are never relieved of their own personal obligations. It falls to them, in communion with the Holy See, both to grant the title "Catholic" to Church-related schools,179 universities,180 health-care facilities and counseling services, and, in cases of a serious failure to live up to that title, to take it away.