Gasser ICEs EVs, but still "following the rules"

Took my kids to the Cal State Railroad Museum in Sac this morning (great museum by the way). The public parking garage has 5 ChargePoint stations and a regular old Chevy was parked in one of the spots. I plugged in and on my way out told the attendant. He said that gas engine cars can park in EV charging spots on weekends. I thought that was peculiar, what's the point of having charging stations if you can't use them? Anyone else encountered a policy like that anywhere else? If I had time I'd look further into this because I suspect that's BS, or local policy that runs against state rules. Let me know if I'm wrong.

As far as I know, the law completely depends on signage. What was posted at the museum?