It's not, but it's not uncommon. Malibu has all sorts of difficult to reach beaches, with threatening signage about "no trespassing" and other such nonsense. All beaches are public property in California, so it's rich people being bastards when they prevent access and pretend like it's their private property.

I make it a point when I'm in Malibu to stomp across several of those "private" beaches, on foot. It takes a while to get to some of them, since access routes are rare. I suspect city planners are sympathetic to the goals of the privateers...there's a few places where it is a few miles between public access.

Hopefully, Half Moon Bay is less amenable to rich people skirting the law.

Also, I never knew Khosla was such a dick.