...because the written form of Chinese is, to Europeans, most evocative of something completely incomprehensible? Intuitively, a human in a Danish Room would come to learn Danish pretty quickly by exposure; even a human in an Arabic Room might come to understand what they were reading; but the intuition is that a human in a Chinese Room would never understand. (Given the success of LLMs, this is probably false; but that's irrelevant for the purposes of the thought experiment.)