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Who else doesn't communicate? The vampire isn't a candidate for having done anything to themselves.

Ok, so specifically, I meant the Bicameral Order from Echopraxia.

The protagonist is a synthesist - whose sole job is to translate the incomprehensible in-language of the augmented scientists to mission control

They speak sensible english.

It's mentioned that they're actually speaking a creole that's been translated and simplified to english for the (baseline) reader.