Musk is a founder in literally every sense of the word. He joined the company early, was a key investor, designed early products, and had a major leadership role (chairman of the board and then CEO) - from the start. In addition, the matter has been adjudicated in a court of law - Musk is a founder. The company Tesla recognizes him as a founder.

Against the overwhelming and undisputed evidence and common sense you have only childish insults. You don't even try to make your case. Sad, but at least you know you're wrong.