I don’t think it’s misleading at all. It’s pure Lutheran teaching.
Perhaps, however, I should be more succinct. We don’t derive the law from either Torah or Exodus or Deut. It’s the law written on our hearts which we certainly can express in various writings.
It's a common misunderstanding even among the most-educated. I recall a spring seminar my 4th year at Sem StL. Voelz and Lessing, among others, were having an on-stage discussion. At one point, Reed Lessing said something about the OT ceremonial law no longer applying to us, implying that the OT moral law does. Voelz responded, "I don't think any of the OT law applies to us!" Lessing was silent. Later, at afternoon refreshments, I saw Gibbs and said, "Dr. Gibbs! Luther's Works, vol 35!" He immediately understood and said, "Absolutely! "How Christians Should Regard Moses. Jim was absolutely right!" Later, I saw Voelz and said "Nice expression, Dr. Voelz, of "How Christians Should Regard Moses." "It's gotta be that way," he replied.
It's a common misunderstanding. In 4th year Biblical Theology with Gibbs, someone mentioned something similar, about only the OT moral law and not the ceremonial law applying to us. Gibbs said, "Guys! We don't get the Ten Commandments from the OT. We get it from the law written on our hearts." He then implied something along the lines of, as 4th year students, about to be ordained, we should know that.
Not long ago, I cited and gave a link to Luther's sermon. It's online in several places. Perhaps if Brian read it he would have an answer to his questions which, after all, are just questions, not statements, that he already knows the answers, though they may not be Lutheran ones.