He might have been offering passive assistance, we can't rule that out. And if he didn't interfere at all, on the same principles as the Lord Ruler, it could be because with Preservation's power he knew they'd get help in time, and could see that they'd go on to thrive on their own. The opposite of what he did with the North, where he all but held their hand. With the South, he pretty much left them alone, knowing they'd actually do really well left to their own devices.
/speculation