Given that the predictions involved are based on long-established, result-yielding large scale astrophysics modelling programs, that's a bit too dismissive. Yes, in the strict sense "scientists" "used computer modelling" and found "a modelling parameterisation" that "seemingly correctly predicts" a formerly poorly understood part of black hole accretion disk structure.

At the same time researchers at Caltech used a combination of well-established models that revealed how electromagnetism, previously not considered, explains observed accretion disk structure.

In the science sense, this is absolutely a "reveal": the combination of models yields data that is consistent with observed reality.

You could say it's revealing something about the physics used as input to the simulation.