Christ, the reading comprehension is atrocious around here.
First, you don't need the PAC link to work. You can look up the D3 national rankings in the defensive categories listed on the NCAA website. You can see that Thiel was behind other conference schools in some of those categories. As I said, if you want to argue that it only meant conference games, the PAC site shows the points scored/points against for conference games only. As you can see, Thiel wasn't first in scoring defense in conference games only. It wasn't first in the conference in at least two of the other categories for overall games.
Regardless if you want to argue that the claim was intended for only conference games or for all games, the claim is going to be wrong.
Your whole explanation of the Maine defense dealt with how they did in the conference. But that wasn't the claim. The claim was about Maine's defense in all of FCS, not just the CAA.
It isn't vague line. It is one, arguably subjective, about his defenses being among the top in FCS. By all reasonable measures, that's false. Worse, the bio claims his defense in 2006 led the conference in the categories listed. Those are patently false. There is no vagueness about it. It isn't exaggerating. Exaggerating is claiming that one has a huge crank instead of just bigger than average crank. Claiming things came in first place when they didn't are lies.