Well he was a coach on the team, so obviously he played a role - the question would be to what extent.
After 1981, Clemson had been a mid-major team until coach Swinney and his staff (including Coach Scott believe it or not) showed up and created a monster. They were so regular that they lost to a Skip Holtz-coached USF team.
Yes they have an awesome stadium, but this did not equal championships until recently, there is no denying that.
Now chill.