Interesting statement since it still runs and you can book a private sleeper room for that route. Same with the coast starlight train that already runs the SF-LA route with sleeper cars.
Note the weasel word all-sleeper. They run a non-sleeper passenger also car on both of the above for those getting off at the smaller stations on the way so that’s how they can claim those services don’t exist when you can just go book them online right now.