这里，是“中国人”不过是个比喻，是对掌握中国语言(与中国文化)的程度的比喻，而且是个挺合道理的比喻。

Here, being "Chinese" is merely a metaphor, and a reasonable one at that, for Chinese language (and cultural) fluency.

youdao

她一点也不知道中国语言的中国文化。

She knew nothing about Chinese culture of Chinese language.

youdao

由于我对中国文化和语言有些强烈的兴趣，现在我在川大中国语言与文化专业求学。

As I am very interested in Chinese culture and language, now I am pursuing Chinese Literature&Culture in Sichuan University.

youdao