No it isn't, creativity has a correlation to mental illness (there's a whole wiki article on it, academic sources at the bottom) and mental illness obviously has a correlation to alcoholism. Correlation doesn't equal causation, but it doesn't equal coincidence either.
I bet they don't drink more than the working class (source: my upbringing was about as working class as it comes, so many alcoholics). Labourers might have a lower tendancy towards mental illness on paper, but thats probably because the rough mining and logging types are conditioned to be solitary manly types and instead try to drink their problems away.
I've never seen one of those before, but it looks fantastic. Crème brûlée + beer.