Like all right-thinking people, I deplore the intrusion of the Feast of the Lord's High Priesthood into Thursday of the former Octave of Pentecost, because it pushes still further back any rapprochement between the Calendars of the two forms of the Roman Rite.
But the OF propers for this new Feast have an interesting fearure. They appear to favour the view called 'Supersessionist', the doctrine hardwired into the liturgical texts of the last two millennia that the New Covenant fulfills, supersedes, the old (Et antiquum documentum novo cedat ritui).
These new texts employ Hebrews 10:5-10 (a document Cardinal Kasper, for obvious reasons, is said to dislike); and include in one of the hymns the phrase "delens vetusta".
I wonder if this phrase survives into the German translation.