This is just wrong.
A priest of this age would have during his priestly vows given his solemn word to God to say the mass in liturgical Latin. He would also have sworn obedience to his church elders.
Vatican II force priest to break their vow to say the mass in the language of their parish or to ask for release from Holy orders so that they would never again say mass.
Now this priest having broken his vow to God so to remain obedient to his elders this bishop will not grant the obedient servant of the church his last wish even though the church now permits the old order mass.
A certain epithet referring to the male genitals seems appropriate.
Maybe certain posts have been deleted, but I see no reference in the posts or the original news report that refers to a 13-year old boy or a gun. What are you talking about?