I honestly don't know, but you put on to fairly impermeable surface a tiny amount of whatever it is and then wipe most of it off, so what can it do? "Ceramic" implies a hard shell of some kind, but the size of the bottle (5 or 6 teaspoonfuls) and the fact that you then rub it off suggests it is far from being an armour plating.
They also call them nano-coatings, because they are only a molecule or two thick. That isn't going to stop it chipping or scratching. Nor will it remove dirt, wax, tar, or cover up previous damage such as swirls that the dealers 'valeter' has probably already put in the paint. I know of one dealership where the car-washers can be seen washing new cars and removing water with squeegees.
On no account would I have a dealer apply it. If there is value it is probably in the preparation. Carefully removing all contamination for a start, and dealing with any imperfections rather than sealing over them. I'd not ascribe any value at all to it on a used car unless it it is going to get meticulous preparation.
I am not a "detailer" myself. The paint on my MX-5 (the only car on the fleet I actually care about the appearance of) was pretty poor when I got it. A fair few swirls, tar spots, old wax, and so on. After a good wash, just going over it with a clay bar removed lots of visible contamination. I then used a cleaning wax followed by a carnauba based wax called Navi-wax that a fellow owner recommended. I used no polish - the swirls are still there somewhere but the wax does a decent job of filling them and making them hard to see. It looks pretty good to me when I've done it, and I don't renew it more than a couple of times a year. It's easy to wash and I hardly got any contamination off when I clayed it again a year after the first time.
I spent £360 having the underside and cavities treated with Bilt Hamber clear wax by a specialist which I thought was a better investment than a similar amount to the dealer for "Paint Protection".
Of course, if the paint was any good it would be the protection.
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Ceramic coating a new car new
Ceramic coating a new car new