I don't think MBV add any additional alcohol to their
e-liquids.
I know MBV use Flavor West flavorings and while I don't know specifically if they do, some manufacturers do use alcohol as a carrier for flavorings.
Best advice I can give you is go to their website (MBV) and chat with a rep - they are always super helpful and offer great customer service.
By the way, I add about 5% alcohol (PGA like vodka) to some of my DIY and store bought liquids. It helps with the flow of my max VG ones and gives a little
throat hit without changing the flavor significantly.
EDIT - Forgot to add that MBV liquids can be perfumy when fresh - especially at higher flavor percentages (with additional flavor shots) Follow the advice in the post below about leaving them uncapped for a few days to allow it to evaporate away.