Well, they didn't mean "schlingen" obviously, so I guess they made up a new word :)

Vienna is probably because of Wiener Würstchen, i.e. the hot dog sausages.

funnily enough the article uses brat, wiener and frankfurter to describe the sausages. i mean you could argue that wiener and frankfurter are the same, but a brat(wurst) clearly is a different type of dog.