Tesla is in disarray. Musk has already moved beyond caring about cars.

The Cybertruck, Tesla's only new model in the past five years, has logged disappointing sales. Tesla sales are in a deep funk. Elon Musk insists he doesn't care. The electric-car pioneer is stuck in one of its worst sales streaks, with the company reporting Wednesday that global vehicle sales fell 13.5% in the second quarter, compared with a year ago. Vehicle deliveries also dropped 13% in the first quarter. Rivals from General Motors to China's BYD, in the meantime, have churned out high-tech vehicles, stealing market share. And Congress is preparing to pull the plug on U.S. tax credits for…