Did you know...? Secession to be implemented immediately after announcement of results

That at least seems to be the implication of the Interim National Constitution, which in Part III, Chapter III, 69(2) says that the President, if from the South, "shall be deemed to have resigned" in the event that the vote for secession wins. Moreover, Part 17, clause 10, says that all parts of the Constitution dealing with the south "shall be deemed to have been duly repealed" if the referendum is favorable to secession. It seems then there is no interregnum, and all negotiations for secession would have to be completed in advance of the referendum, since once secession is voted for the two sides become sovereign immediately.