Interesting. I don't have quite the same impression. To me it feels like they're generally well spoken but with a decent amount of a casual or conversational style.

In essence, I'd bet it's a relatively clean and efficient use of the language where you could probably transcribe their words and not need to make many corrections for written publication. Fewer fill words ("like", "umm" etc) and pauses and relative fluency with their selection of meaningful but not bombastic words.