Looks like it was open in 2021 and 2022, but I haven't heard much about it. The reviews of the reservation process and particularly the gate code issue aren't great.
https://www.blm.gov/press-release/blm-restores-motorized-vehicle-access-clear-creek-management-area...
Just read this on Tom Severin (gives excellent 4x instruction) pushed newsletter:
The California Superior Court of San Luis Obispo County has ruled that the California Coastal Commission does not have the authority to prohibit motorized recreational and overnight camping access at Oceano Dunes...