Looks like the article acknowledges that:

> These off-season plantings have long been used to keep soil and nutrients in place and prevent runoff that fouls waterways. But that’s not why they’ve become a linchpin of the red-hot climate-smart and regenerative agriculture movements. With support from influential international bodies like the IPCC and leaders like former vice president Al Gore and U.S. Secretary of Agriculture Tom Vilsack, cover crops are being asked to do something new and high-stakes: draw atmospheric carbon into the soil to help fight climate change.