Synthetic does not mean fake
A synthetic aroma material can smell natural, abstract, clean, woody, floral, metallic, musky, airy, creamy, salty, or warm. Some reproduce facets found in nature; others create effects nature does not give at useful strength.
The better question is not natural or synthetic. It is: what function does this material perform in the formula?
Commercial translation: never apologize for synthetics. Explain what they make possible.