Musk doesn't value people – this is apparent from all of his businesses, he doesn't care about work life balance, inclusive hiring, etc.
From this, it does follow that if you've got some secret-sauce at your company, and it's NOT your employees and their experience, then it must be something else. If you're Twitter, then it's probably The Algorithm, or code printed out onto reams of paper. After all, that's what makes the money right?
Except as is obvious to most companies, it's not. The people, the shared understanding, the experience, the company culture, and even the context of the world that the product is a part of – these are all far more important than the actual code, and where any long-term successful company focuses their efforts.
To put it in terms Musk might understand, product and engineering teams are "stage 0" for a software company, they are the machine that builds the machine.