This is so vague (plus they posted what I believe is a San Jose station rendering):
The Palmdale Station will serve as a connection point for California high-speed rail, Southern California Regional Rail Authority (Metrolink) and Brightline West, creating a seamless connection between California high-speed rail and Brightline’s planned high-speed rail service to Las Vegas via Palmdale.
How do they define "seamless connection"? Having to board a CAHSR train and then transfer to a Brightline/Virgin/Blue Origin/Pets.com train in Palmdale isn't "seamless", even if they build flying crossovers and you're able to walk across an island platform to a Las Vegas train that leaves 5 minutes after CAHSR arrives.
The LA>LV scheduling will be odd in any transfer scenario since CAHSR express trains, which will not stop in Palmdale or travel on any shared LVHSR track, will nevertheless influence the Las Vegas schedule.
Any HSR system like what is being built has 12 time slots, per direction, per hour. But a system as complex as CASHR will be at full build-out means express/skip-stop/local won't progress in the same order during differing hours with similar service levels. This means some Las Vegas-bound trains won't have enough room for everyone who seeks to transfer but another leaving just 10 minutes later might only be a quarter-full.