I’ve got a Master’s in German; maybe I can be of assistance:
Here is a scan of the New Testament Index in Luther’s 1534 Bible - we can see that the last 4 books (Hebrews, Jude, James, Revelations - “Offenbarung”) are put in their own section at the end (an “addendum” or “index”):
Die Propheten || alle Deudsch.|| D. Mar. Luth.|| ([Bd. 2]) - Digitale Sammlungen der Herzogin Anna Amalia Bibliothek
Already this shows that Luther didn’t put them on the same level as the rest of Holy Scripture. But in the introduction to that section, which can be seen
here, Luther writes the following in archaic German, which I will translate to English:
Translation:
"Up until now we have had the well-known main books of the New Testament. The four following, however, have for a long time had a different character. And first of all, the fact that this Epistle to the Hebrews was not from St. Paul nor any other Apostle is proven by what it says in one of its chapters: “This teaching is as if it came from the Lord to us.” By this it becomes clear that he [the author] is speaking about the Apostles as one of his disciples, to whom this teaching of the Apostles came, maybe long afterwards …
The Epistle of St. James, although it was ridiculed by the Ancients, I praise and hold as good, because it doesn’t set forth any worldly teaching (“Menschenlehre”) but drives forth God’s law. But if I may voice my opinion, without harming the work, I don’t believe it to be Apostolic writing, because it is directly in contradiction with St. Paul and all other scripture about working for justification."
No where does he say he wants to remove them. The fact that he would included it refutes the notion.
From your translation:
The Epistle of St. James, although it was ridiculed by the Ancients, I praise and hold as good, because it doesn’t set forth any worldly teaching (“Menschenlehre”) but drives forth God’s law.
He is here referencing the ancients, at least in
part Eusebius. He praises it, and includes it.
He does categorize it as Antilegomena, a category he did not make up. But he did include it.
It is often the case when it comes to Antilegomena books, Luther sites authorship.
So, there we have it. Luther removed the books because they did not align with his understanding (“sola fide”).
So, there you have your interpretation. No where does he say he removes books because he disagrees with them.
Luther thought his personal understanding to be more valuable than 1,500 years of Tradition, the Early Church Fathers, and the Ecumenical Councils.
Oddly, in the quote you provide , he references the ECF’s. Your interpretation seems to be that by citing them he ignores them.