Control arm ball joints are not a maintenance item. On any car. Ever.
I'll agree that, today, many (but not all) new cars come with sealed ball joints. But that's a fairly recent development. "Chassis lube" historically has always included ball joint greasing. Even as recent as the late 90s, maybe early 00's even - chassis lubrication, including ball joints, was listed in the maintenance schedule on most vehicles.
So to say it's not a maintenance item on any car, ever? Flat out incorrect.