I think they're trying to differentiate themselves from what a lot of people see a barman as: Unskilled labour.
and rightly so. If it paid better and didn't have the hours it does I might well be too. :)

You, of all people, can't begrudge someone a little pretension now, can you? ;)

I don't mind pretentious, but ludicrously enhanced job titles are a step too far. Like when our photopying staff became "reprograhics operatives". It sounds desperate to me.
ludicrously enhanced job titles

"Replenishment assistant" appears on a large number of CVs. It is my favourite.