To place something AMONG things is not to equate with them.
Again, my Bible has some 300 things listed in the Table of Contents. All placed AMONG the Sacred Scriptures. That doesn't mean ergo some grand, authoritative Ruling Body of Christianity declared all 300 things to be inerrant, fully canonical, divinely inscripturated words of God. It simply means the publishing house markets a tome (with the word "BIBLE" on the cover) with lots of stuff in it, some 240 of which might not be regarded as Scripture.
I know nothing of that, but even if he did say it, it seems he didn't do that. He didn't include 3 or 4 Maccabees, but 2 Maccabees is there in his German translation.
If you want to buy a tome with 2 Maccabees in it, you can. NOTHING prevents that. Easy. Simple.
If you want to buy a tome without 2 Maccabees in it, you can. NOTHING prevents that. Easy. Simple.
If you want to celebrate the Passover, you can. NOTHING prevents that. Easy. Simple.
And just a heads up.... Lutherans really don't care much what Luther said. Luther is not considered authoritative (or right) on anything simply because he said so. He said some wise things... he said some stupid things. Kind of like a lot of people. And his views changed (sometimes radically) over time (for much of his life, he was still very much Catholic, for example), and he doesn't always write in definitive ways (for example, he can use the same word to mean VERY different things).
.