While it's true that the NYT recently released a report on Musk's apparent increase in drug use, there's no evidence to show that he did ketamine while in the Oval Office or when this particular Bedminster dinner clip was filmed—which the report acknowledges: "It is unclear whether Mr. Musk, 53, was taking drugs when he became a fixture at the White House this year and was handed the power to slash the federal bureaucracy."
This Daily Beast article discussing the dinner and its social media aftermath also provides no evidence that Musk was actively on ketamine at the time. The only source that appears to suggest that directly is the poster of the video, nurse and retired army medic Molly Ploofkins, who cites no evidence and whose content on X is largely anti-Musk.