They sold part of their merch rights, why wouldn't they be able to spend money? They want to have a competitive team to maintain or improve their income. It is as simple as that, not spending was not an option because the team was already in shambles, which means less money overall for the team, less attractive for foreigners etc etc.
I'm a RM supporter but I believe they did It right, the other choice was to let the boat sink. Now, the problem with this strategy is that if It goes wrong, the club is absolutely done, they will have to sell It to whoever wants to purchase It. They are restricted in terms of salary, that's why they are struggling to be able to use all the new players, they need to get rid of some of cut some salaries, otherwise they will be stuck with players they can't use at all.
They will exist in any case, if things go absolutely wrong, they just sell the club to some rich ass petrol prince and end of the story.