Yup. He's also removed people from Tesla beta programs if they say anything negative about the company. He's also accused people of being pedophiles for saying negative things about them- going so far as hiring people to try and prove the baseless accusations.
Elon is not a free speech advocate. He'll pretend to be occasionally, but that's not the same thing.
I also recall him firing people who supported unionization and employees who talked to reporters.