That's the structure of it. It's not really about the spelling. If you put "som" before "regionerna" you make it sound as if you literally want to spell the problem the way "regionerna" is spelled, which is "regionerna". That's not the point of that structure. That middle word(s) implies that the second something is the cause of the first something. It's a 'direct' causation that is implied and "som" would in this case be wrong I think.
What the politician means is that the whole of Sweden should be considered as one healthcare region, instead of the 20 regions there are today, as it's the division into 20 regions that (according to her) is the fault of the Swedish healthcare system. https://www.dn.se/sverige/kd-vill-ha-nationell-plan-for-varden/
Owl, I would add that reading only the quoted sentence doesn't make it clear that that's what the politician meant. It could also have been that the problem was not with having regions as organizational units but rather that the units just worked poorly, and that having them would have been fine if they worked properly.