Nothing's changed there, except the range and quality of clear topcoats to which you can add the tint of your choice. I think that's the finish in the case of the guy who posted that gorgeous Willier, it looks like a chromovelato. I don't think it's a copper plating over chrome or vice versa, since you dip the entire frame when you do a plating, and won't see, for example, a chrome chain stay on a copper plated bike.

FWIW, a typical professional chrome plating job will have the bike frame dipped three times, first in copper, then nickel, then chrome. A copper plated bike will simply have skipped the last two steps, and have the copper plating polished out.