Churchill's famine is a different story altogether from the famines stated in the article though. Churchill's famines were directly a result of food exports to the rest of the Commonwealth while India starved. On the contrary, these famines mentioned in the article were often the usual in India at the time. While the Northern plains are very fertile, there is also a strong "luck" element that depends on the timing of rains and the monsoon season. Getting them wrong was often the reason for a large number of famines across the country. The southern part of India is largely mountain plateau and jungle and agriculturally poor, hence they often relied on imports from the north.
What really changed the equation for India was the Green Revolution, which happened because the first PM, Jawaharlal Nehru (a figure the current govt loves to denigrate and pin all their faults on), invited Norman Borlaug to replicate his Mexican success story for India.