The book of Daniel contains manuscrips from a long range of time. A later editor must have bundled these manuscripts. Therefore you should differentiate the date of origin between the different original manuscripts and the later editor.
I found there is a shift of the king's title visible in the book of Daniel which ocurredoccurred between Darius I and Xerxes (https://hermeneutics.stackexchange.com/a/37656/27923).
The notes of Frank Luke appeal to me as for the original manuscripts, but are they also true for the connecting texts?