Let's not forget that Khosla himself does not exactly care about public interest or existing laws https://www.google.com/amp/s/www.nytimes.com/2018/10/01/tech...
I just read the article, and am not sure I see the issue. Quote from his lawyer: “No owner of private business should be forced to obtain a permit from the government before deciding who it wants to invite onto its property"
Where's the issue here? They guy basically bought the property all around the beach, and decided to close down access. I wouldn't say it's a nice thing to do, but it's legal. If I buy a piece of property, my rights as the owner should trump the rights of a bunch of surfers who want to get to a beach. The state probably should have been smart enough not to sell all the land.
Failing that, just seize a small portion via eminent domain: a 15-foot-wide strip on the edge of the property would likely come at a reasonable cost, and ought to provide an amicable resolution for all.
The courts already decided agaist him, he just can affort to pay the fine and continue restricting access