Winning at home doesn't necessarily indicate a home-ice advantage, it might just indicate a good team.
Think of the odds of winning as the sum of: how likely you would be to win on neutral ice + any home-ice advantage. Just looking at the sum of the two, how much each team has won at home, doesn't help you determine any home ice advantage.
If UND wins 75% of its road games and 75% of its home games, it has no apparent home ice advantage; whereas if St. Cloud won 0% of its road games but 50% of its home games, that may indicate a huge home ice advantage. In those scenarios, UND's home winning percentage is .75 and SCSU's is only .50, yet playing at home is clearly a much more critical determinant of SCSU's outcomes than UND's.
That said, UND did seem to have a home ice advantage in '08, though it was far less pronounced or even reversed for most of the years between REA opening and 2007. Compare UND's performance at home vs. on the road:
http://siouxsports.com/mens-hockey/standings/2008/