That’s not quite right. They hired a theoretical physicist to provide them equations for simulating a black hole. Then, the SFX studio used their Nolan Movie Money to generate it extremely accurately to the extent that it helped spawn further research. It’s not that the studio happened to get it right from research. They were given all the pieces they needed and were able to do something these physicists had a hard time doing likely because they never had that kind of money/equipment: make an exceptional, high-fidelity, cinematic simulation.