On whose authority did Luther remove the Apocrypha?

From New Advent:

Gospel of St. Peter

The existence of an apocryphal composition bearing this name in Christian antiquity had long been known by references to it in certain early patristic writers who intimate that it originated or was current among Christians of Docetic views. Much additional light has been thrown on this document by the discovery of a long fragment of it at Akhmîn in Upper Egypt, in the winter of 1886-87, by the French Archæological Mission. It is in Greek and written on a parchment codex at a date somewhere between the sixth and ninth century. The fragment narrates part of the Passion, the Burial, and Resurrection. It betrays a dependence, in some instances literal, on the four inspired Gospels, and is therefore a valuable additional testimony to their early acceptance. While the apocryphon has many points of contact with the genuine Gospels, it diverges curiously from them in details, and bears evidence of having treated them with much freedom. No marked heretical notes are found in the recovered fragment, but there are passages which are easily susceptible of a heterodox meaning. One of the few extra-canonical passages which may contain an authentic tradition is that which describes Christ as placed in mockery upon a throne by His tormentors. Pseudo-Peter is intermediate in character between the genuine Evangels and the purely legendary apocrypha. Its composition must be assigned to the first quarter or the middle of the second century of the Christian era. C. Schmidt thinks he has found traces of what is perhaps a second Gospel of Peter in some ancient papyri (Schmidt, Sitzungsberichte der königlichen preuss. Akademie zu Berlin, 1895; cf. Bardenhewer, Geschichte, I, 397, 399).