Hi again,
As you correctly wrote, events on a quantum scale are not predictable. Outcomes of quantum processes are not completely pre-determined by the laws of physics. However, the evolution of their probability distribution is: that’s exactly what Schroedinger’s equation does. This is unrelated to the question of granularity and whether space-time is continuous or granular.
Regarding granularity: I believe that Rovelli talks about granularity in the context of space-time, which in his theory of quantum gravity is not continuous but discreet. So, granularity is not a property of “things” but of space-time itself.
I’m not exactly sure how this property relates to entanglement and non-locality; if you’re interested in this topic, I’d recommend this Scientific American article: https://www.scientificamerican.com/article/spacetime-is-not-necessarily-continuous/
Hope this helps!
Marco