According to the new Terafab website, Tesla will be contributing CapEx to Terafab (not just the research facility):
"The initial phase of Terafab is estimated to require approximately $16.8 billion in capital investments from SpaceX and Tesla, with potential future expansion phases bringing total investment much higher. This facility will employ at least 3,000 people, many of whom will be from Grimes and nearby Brazos County — continuing the trend of our other Texas sites where between 60% and 80% of new hires are local residents." $TSLA