Of course, in the Doctor Who franchise, death is often only temporary, and since we didn’t see Rose die onscreen in the finale, she might still be alive. It’s entirely possible that her universe being cut off from ours means that Sutekh was never able to activate his Susan there and couldn’t unleash the dust of death.
Until we see Rose’s beautiful face again (come on, Davies, we’re begging you!), though, we have every reason to believe that Disney+ just killed everyone’s favorite companion, a particularly egregious act considering that new companion Ruby Sunday always felt like a cheap Rose knockoff.