I could be wrong, but I think the ESPN writer is saying that:
The Greenville 2 Region is the only region that doesn't have a team that's won a national championship in its region
LSU and their coach Kim Mulkey are in the Greenville 2 Region with IU
Mulkey has won three championships, but those were at Baylor, so:
No teams in the Greenville 2 Region are coached by coaches who have won a national championship at their current school
It's confusingly worded, though, and I had to reread "the Hoosiers have a three-time champion coach in LSU's Kim Mulkey" part a few times to be sure of what they were trying to say. Might have been clearer to say something like "lurking in their region" right after that bit.