Nitish Kumar Reddy played very well scoring century and helping his team score 369 runs from difficult situation. Even though India is still behind Australia by 105 runs Reddy performance has given them chance to catch up.
Nitish Kumar Reddy played very well in the fourth Test match against Australia and he scored an important century. The century he scored against Australia was probably the first century of his Test career. Where every batsman in the Indian team failed to perform well, Nitish Kumar Reddy batted very patiently and very well.
Australian team with Konstas and Khawaja batting is expected to score fast and might quickly reach 300+ runs. This could give them big advantage allowing them to try to win match by taking wickets and using their time well. India bowlers especially Bumrah and Akash Deep need to do their best to slow down Australia scoring and keep India in match.
Like in the first innings, the Australian batsmen could not score runs at a fast pace, the prediction you made about them may not be correct, because 6 batsmen of the Australian team have already been dismissed. In today's match, the Indian team is still leading, if the Australia team cannot give the target of more than 300 runs to the Indian team in this match, then it can be said for sure that Australia will lose this match.