it ain't real cherry

Doja Cat's song "Candy" has a quote that says "she's just like candy, she's so sweet, but you know that it ain't real candy, know that it ain't real candy". The quote implies that someone is very sweet, but the cherry in it is not real but in fact chemicals and nasty sugars. So saying "it ain't real cherry" would be like describing something that seems sweet but isn't good for you. Or if someone is "fake"