I think it might be partially intentional too. Nigel always has this pristine footage with uniform white backgrounds. It’s almost clinical, and the inflection is kind of on theme with that.

In nileblue he doesn't talk like this. So clearly intentional.

Yeah I don't find it offputting, it makes sense for the presentation style. Although it's a bit jarring when you can feel like he's paused in the middle of a sentence to move to the next line.

That's why I cannot watch anime dubs. American voice actors are acting. Original seyuu often talk like normal people (there are exceptions of course, but in dubs it's 100% acting, they use "cartoon voice" which I hate).