I have zero issue with the idea that he could have been supporting United in the early 90's or before.
It is however quite fortuitous that the year he became a United fan was '92, a year in the club's history that has already been heavily branded in recent times, allowing him to incorporate that concept into his his bid. And it will seem even more fortuitous if, purely hypothetically, any members of the class of 92 who have no issue taking Qatari money lend their name to this ownership group in the future.
But hey, maybe I'm just unfairly cynical about the sincerity if this totally-not-state-backed good samaritan with a mysterious pool of cash.