Michael Burry of “The Big Short” fame is doubling down on his bearish thesis on Nvidia , raising red flags on a line item in the chipmaker’s latest earnings report that echoes a pattern seen at the height of the dot-com bubble in the late 1990s. Burry, in a Thursday Substack newsletter, pointed to a surge in Nvidia purchase obligations, which climbed to $95.2 billion from $16.1 billion a year earlier. Total supply obligations, including inventory and purchase agreements, now stand at roughly $117 billion, nearly matching Nvidia’s annual operating cash flow. On the company’s fiscal fourth quarter earnings call Wednesday, Chief Financial Officer Colette Kress said inventory rose 8% quarter over quarter and that Nvidia had “strategically secured inventory and capacity to meet beyond the next several quarters, further out in time than usual.” For Burry, Nvidia’s comments suggest that the largest public company in the United States is committing to buy large amounts of supply before it…