Not really. He was there for 6 years spending the last 4 years in the National League. For all his investment, they've had one promotion in that time. In the last two years, they've had five managers and finished mid-table, underperforming based on the money they spent.
Sunderland is too good a chance to pass up, if you have the money to throw away in the short term, but he doesn't have that. My main reasons for thinking he's naive is that he's brought in a manager who doesn't know the English league, but will be expected to hit the ground running, and that he's dependant on getting the going rate from player sales and not having to pay up contracts, despite the players and other clubs having all the bargaining power.