Dear Menachem,
I’m aware. Some of these letters are right before the letter to Rav Zevim. (My chakira is, was the Rebbe saying that this is the way it was, or the way it should have been. Of course he is saying that now it is that way. But he didn’t have a clear way of demonstrating it. If he did, he would have told it to Rav Zevin at the very least.) The Rebbe knew about the misprint, is my only point.