Firstly, what I was disagreeing with you was your interpretation of the 2006 game. You were trying to tell a person that was AT the game that he didn't see what he thought he saw, based on an incomplete youtube video, and that there was no try after the kick in that game. Even though a quick internet search for the game's box score proves you wrong. Ridiculous.
Secondly, although the source in the link is an NCAA official (named Victor Winnek), he could be wrong. Note that the quote in the post was not the rule but rather the source's interpretation of the rule. The actual rule cited in the link reads:
"The ball shall be put in play by the team that scored a six-point touchdown. If a touchdown is scored during a down in which time in the fourth period expires, the try shall not be attempted unless the point(s) would affect the outcome of the game."
Since the defense can score, it's not clear in this case, and Mr. Winnek's interpretation seemingly could wrong.
Thirdly, although Mr. Winnek's comments were posted in 2008, there is no indication in the link that this rule was put into place in 2008 or any other time after 2006. So it could very well be that the same rule applies now as it did in 2006, when you
did have to attempt the PAT after a last-second TD to go up by 2 (or 1). (As evidenced by the BYU/Utah game.)
It sounds to me like it's possible that the rule has changed, but not certain.