Ironman has to be on top of the North mod. I should have written that in description. In version 6, it did not matter because the main mod had no citizen setup. In version 7 it has for the happiness patch and Ironman needs to overwrite this from above.
I tested the mission with Ironman loaded on top and they die to starvation pretty fast. Good luck with this. =)
Of course, how stupid of me not to think about the load order. I must “accidentily” have made it right in other ironman games of version 7.
I will try it later this afternoon, maybe it takes too long to build a first store, so it can’t work. I’m pretty sure I’ve managed the start of survivors on harsh with ironman but if remember it right, they bring an empty bag to put the first food in.