Software Engineer here (with experience in the liquor industry)... So, this is a bit of a tricky question to answer and entirely depends on what kind of data you're looking to extract. There's a lot of different data that could be extracted from different resources.
Region (it was created)
Basically, they are experts in beer. They are knowledgeable in everything from the brewing process and the beer styles to properly serving beer and how to pair it with food. Yes, there are certification programs around, such as this one. I'm not sure about training, but it seems like it involves a series of exams, much like actuarial exams or the FE and PE ...
According to the article you linked to, the specific draw of tank beer is that it's unpasteurized. This does also exist (albeit not served from tanks) in the form of Real Ale, or Cask Ale in Britain. Historically, this was not only popular, but the primary distribution mechanism for beer in Britain a hundred years ago. However, its popularity has ...