No, in eucalypt forests after intense fires, the understory regrowth is usually thick scrub. To the point of impenetrability. Mild fires result in a more open understory, which is the reason for the 'fuel reduction burn' programs we have. Few of these done this year - conditions have to be just right, and the forest dried out too early.

Not that grass regrowth would particularly benefit sambar, as they are browsers, of the coarser plants, not grazers.