Actually the article states: “One theory, which emerged in 2012, is that climate change led to the collapse of the ancient Indus civiliSation more than 4,000 years ago.” If the 2 mile wide bolide crater found in the Iraq Marshes was a little more than 4,000 years old, then being in the path of the prevailing wind, the Indus Valley could have suffered. Also, I wonder if that meteor strike could have generated a significant tsunami, and has anyone looked for such evidence?
The collapse of the Indus Valley civ used to be attributed (accurately, IMHO) to the Aryan invasion; in the postwar modern world, it became inconvenient, politically, to attribute the IndoEuropean domination of India to a colonizing invasion event, so the Indus Valley was appropriated as the roots of Indian civ. The written language doesn't exist in long texts, and has so far baffled the consensus of scholars, but most agree that the writing system records an agglutinative language (which is consistent with most of eastern Asia, as well as some outliers like Turkey), making it NOT Indo-European.
That doesn't negate the idea that a catastrophic event triggered the mass-migration of groups into new areas, overrunning civs under stress.