EMEA means "Europe, Middle-East & Africa" I believe? Why would that imply the author is particularly familiar with British idioms? I'm from that region and have never heard of that until now.
But the UK is the most populous English-speaking country in Europe, and the second most populous in EMEA as a whole (after Nigeria), and the only English-speaking G7 member in the region. If an EMEA-based company is looking to do business with UK customers (which I don't doubt is a less enticing prospect than it was, thanks to Brexit), it would be advised to avoid associating itself with the word "cowboys" in anything other than a literal sense.