Many people who have "gone modern" (even this old fart) treat 1mx differently than we treat 1Mx. There are multiple reasons for this distinction.
I was assuming old style, earlier --when trying to say what redouble, 2D, 2S, and 4D meant in the OP question. Perhaps this was wrong to do, but I thought that was what OP was asking.
After a redouble, rebidding 2D with KQX XX AKJTXX XX (a very nice minimum) makes much more sense in "modern". Passing with this hand makes much more sense in "old".

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