Ciao Janita,
although common sense and basic knowledge of essential oils chemistry had brought me to the conclusion that essential oil of lemon juice was a hoax, I phoned to my friend Angelo in Calabria who produces lemon and Bergamot essence.
He confirmed that no essential oil is present in the juice of citruses and is extracted from it.

Maybe you can tell me offline who is the seller of that product and maybe I could have a sample to check.

AbdesSalaam Attar
Compositore Profumiere