Musk leaves the board in 2018 I think. And something happens in DX-754 where they've pivoted to AI in SpaceX around then too. I had a lot of trouble telling what "AI" meant in late 2017 at Tesla.

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Sept 1, 2017 DX-669: Funding paused confirmation. Elon is still on the board for a while. DX-707 specifies the board as of Sept 26, 2017, and even suggests adding Shivon, Jared, Sam Teller.

Jan 31, 2018 DX-748: Elon is still discussing things with Greg. Elon: "The only paths I can think of are a major expansion of OpenAI and a major expansion of Tesla AI. Perhaps both simultaneously"

Feb 3, 2018 DX-754: Sam Teller says Elon "just suggested we use SpaceX email for AI stuff so switching over to that"

Feb 4, 2018 DX-755: Sam Teller and Shivon Zilis discuss disabling Openai

Feb 20, 2018 DX-770: Elon officially leaves board (first document I see specifying)