I've never heard of or seen solid colours being clear coated, it would make no sense.
Is it possible to please post a link to info confirming that solid colours on vehicles now get a clear coat on top?
They have been doing this for years, I had a Rover over 25 years ago that was lacquered over a flat blue.
It makes lots of sense. Far less expensive base colour is used, a single paint process for all colours, and the new water based paints do not give a hard wearing finish. The final finish is tougher than a solid paint, and the lacquer also gives UV protection, reducing fading.
Google it, there's plenty of info out there.