Koch's Home Run Against LSU

I was never able to tell whether or not Kock’s HR was a true HR. I recognize the officials ruled it an HR; I’m assuming they saw something that I never could ascertain. Aside from the fact that it was the difference in the game, any thoughts?

Later in the game the announcers said they got word from LSU fans behind the left field fence that it was a fair ball. I suppose it landed to the right of the foul pole. The only time I saw the ball was when it kicked back toward the left behind the fence after hitting something out there. The TV’s camera angles couldn’t tell me anything. I assume the umps had a better angle.