Obviously the DI coach in question sees that the player has enough potential to contribute in DI.
So this isn't even a 2-sided issue.
There are some players who are underrated by WIS, others who are overrated. As someone said, there are D2 players in the 700-800 range, and yes, those guys should by-and-large really be on DI rosters.
(Oh, and let's not overlook the not-so-insignificant fact that most of these "D2 players" are DI players being pursued as a pulldown or dropdown by a D2 coach)