I guess his time at Auburn and FSU doesn't count. As far as his time at NC State, I pulled this from his official bio on hurricanesports:
"[Stroud had an] eight-year run at N.C. State, first as director of strength and conditioning from 1999-2004, and then as associate head coach/defensive line from 2004-06. In 2004, Stroud helped the Wolfpack allow just 221.4 yards per game and 102.4 rushing yards per game, both of which rank second in school history. In 2005, Williams set single-season school records in both sacks (14.5) and tackles for loss (27.5). Williams (Texans), Manny Lawson (San Francisco 49ers) and John McCargo (Buffalo Bills) were all selected in the first round of the 2006 NFL Draft. "
It's possible he's exaggerating their talent. But I think it's unfair to say he hasn't been exposed to high level talent.