All I could ever find was a clip of the awarding of his masters. In that clip, the degree was announced (master of arts in criminal justice) followed by the announcement of each student name as each walked across the stage. But how graduate degrees are awarded may or may not be how undergraduate degrees are awarded at a particular school. I never saw a clip of the undergrad degree awards but I'll take your word that it was done the same way.
Looking at the clip I have to say his eyebrows didn't look particularly bushy in that.
JMO
I don't think he ever had "bushy eyebrows," but I do know that's how my students describe men with prominent supraorbital ridges (the torus). Indeed, the few women who have more of a brow bone often describe their actual brows as "busy" when in fact, they just appear more prominent because the bone underneath bulges.
Same woman pre- and post-brow reduction (looks like some chin reduction too and of course a nose job). But my point is that people do not usually say "They have big ole brow bones" instead observers say "Bushy eyebrows" as it is a common phrase for describing very visible brows. In this picture, of course, the woman has groomed her brows.
The second picture is one that I've used in class and people will say the man has "big brows" or "bushy brows." I have to point out that "big brows" is more accurate, but not quite. What they're seeing are more robust brow ridges (that's the proper terminology in regards to the variation in human brow ridges). It makes the eyes look more deep set. In the picture of the man below, his actual brow hairs are normal, but I still get "bushy brows" written down by students:
In the last picture, the brows are indeed a bit hairier, but still not "bushy" (to me). But we have to take into account how the witness uses language - and what I'm saying is that it's possible she uses it the way her age mates elsewhere use it.
This last guy always gets "bushy eyebrows" and "big nose" as his descriptors (and almost no one remembers to add "square ears" or "slightly receding chin" because the first two traits are what fixes their attention and is therefore stored in memory. And indeed, this man's eyebrows are hairier than average.
These are "bushy eyebrows:
And there are men with even bushier eyebrows than that. And cultures that expect men to have them and grow them proudly (I don't think contemporary college age men would allow their brows to get that bushy, IME, IMO).
At any rate, the term "bushy eyebrows" is used ambiguously by most college age students I've encountered.
IMO, IME.