It is. Even before the latest update, there was no consistent strat of getting a likely pass on the higher cost exit door. Maybe one-in-a-hundred chance once you know what you are doing. All down to luck with rerolls, and then you have to hope you have enough time left to not get screwed by the board.
Hilariously, the latest patch made this even harder by adding mutators that 1) replace one global activator with a Right activator 2) deal less cards to the final board, lessening the profit.
But I guess the devs are blinded by people posting pics about that one broken combo, thinking that "oh that exists, so game must be fine, we're so quirky"
Devs with zero understanding on how to balance things. The difficulty for the 9990 door comes from all the wrong reasons.