By that logic then you'd need the WBA regular title to be undisputed. If it requires the name of the older version of the most prestigious title that governing body can grant, rather than the actual most prestigious title they can, then WBA Super belt shouldn't count either. This weekend is undisputed, and it was literally confirmed by the WBC this morning that they consider it to be so too.
He had two fights before that, against Risko and Gibbons (top contenders at the time, the latter being a bonafide ATG IMO), then he fought Dempsey. It's less than five fight it would seem. There's also the chance that the listed weights on Boxrec were wrong. Although back then the weight classes were much more malleable. Instead of having to make weight for all fights at the weight, it was mostly just eliminators and title fights.
IMO this fight shouldn't be considered a undisputed fight mainly because nobody knows what the Franchise even means. Even the ****ing crook Sulaiman doesn't know.