Other clubs who went out of business were classed as new clubs when they started up again. Supporters of Airdrie United, and Gretna 2008, know this only too well.
Clearly the money Rangers bring into Scottish football was deemed too important to risk losing by applying the same criteria to the plucky newco that was applied to Airdrie United, and Gretna 2008.
Effectively, all 3 clubs are the same club, but technically only TRIFC were allowed to assume the identity of the cub that went out of business.
Incredibly, after being granted this special dispensation to take on the identity of Rangers, instead of being grateful about it, their fans marched in protest to Hampden! I can't remember which load of Scheidt they made up for that one, probably the "We wurr illegully demotit tae the bottm tier" nonsense. they still come out with 'till this day.
Rangers had to apply to join the league, fact. They were eventually accepted into the 3rd tier of the Scottish leagues. Their fans keep whining about how they were demoted, or relegated, to the bottom tier, when they know that didn't happen.