Yeah, I'm skeptical of the "one sellout" thing. For those games you listed I distinctly recall no tickets being available. If that's not a sell out then I don't understand the meaning of the term.
There's always a few no-shows, even for sold out games, at any stadium. So I would think that's not the metric being used.
The '92 Texas game is listed with an attendance of 49,238, the tOSU game that year was 49,629 and Miami was 49,857. That's when capacity was 49,550, so I would suspect that Texas was a sell out with a couple hundred no-shows and tOSU & Miami were sell-outs that managed to run over capacity.
10/30/93 against WVU is listed as 49,268, which is suspiciously close to the same count as Texas the year before, which again makes me feel like it was a sellout with a few no-shows.
11/30/96 agaist Miami was 49,426. 11/28/98 against Miami was 49,521. Hard for me to believe either wasn't functionally a sell out.
Maybe someone in the SUAD figures that if there's a handful of single-seats, or handicap seats, or whatever then literally speaking it's not a sellout. But to me if you can't get 2 together, which crowds in the 49,200+ range most likely are, that's as good as a sellout.
*edit* '98 Tennessee attendance is listed smack dab at 49,550. That's reporting a sellout, no doubt, since that's exactly capacity.