Yes, that light show was from a SpaceX launch
Briefly

SpaceX launched a Falcon 9 rocket from Vandenberg Space Force Base on Monday night, successfully deploying 26 Starlink satellites into orbit. The launch took place at 8:36 p.m., and the rocket reached low Earth orbit approximately 8.5 minutes later. Notably, this was the third flight of the mission's booster stage. Following its mission, the booster was set to land on the drone ship 'Of Course I Still Love You' in the Pacific. SpaceX's launches are often marked by impressive vapor trails and sonic booms, captivating witnesses across Southern California.
SpaceX is known around the Southland for its highly visible vapor trails as well as its sudden booms.
The rocket lifted off at 8:36 p.m. from its launchpad at the California base and reached low Earth orbit about 8½ minutes later.
Read at Los Angeles Times
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