Looks like it has a coat of gray primer under the green topcoat.
The question is did they sand the chrome with a DA sander prior to priming the bumper?
Aircraft Remover will get the paint off. Put it on heavy and let it wrinkle up. Scrape that off with a plastic spreader and do another application. The more you get off with the stripper, the less you will gouge the chrome.
FWIW I bought some vintage DC chrome valves off eBay that had two coats of engine paint, each different colors and looked it. I hit them with Easy Off follow by mothers metal polish and they came out like this:
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