He is referring to laws like SB1047 that will make open source model makers liable for who uses them, and may scare companies like Meta from releasing any more.

He is referring to laws like SB1047 that will make open source model makers liable for who uses them, and may scare companies like Meta from releasing any more. E.g., preventing the release of llama 3 400b, which might be the first GPT4-grade OSS release. Locked out maybe, but more about 'not closing the door' vs 'keeping the door open'.