Hang on. This market wants you to submit in conformity with their style-sheet, including serial-comma prejudice et al...?

Oh, fer cryin' out loud! These are matters for the copy-edit stage, after - maybe long after - they've accepted the work and are committed to it. Emphatically not to be imposed on hopefuls as a prerequisite for submission. I am struggling somewhat to find a word to describe such a demand, but "professional" is not anywhere in the lexicon.