Even if your entire measure of bias is based on refusals (which is going to be bad measure for other reasons, but certainly easy to construct), there is considerable bias that goes into selection of what things to include tests for refusals on.
There's a difference between bias and area of focus. A math test that asks questions about trigonometry is not "biased" towards trigonometry, as compared to a math test that asks questions about probability.
Selecting topics that are frequently commonly censored in Chinese media is a reasonable area to focus on, because this is a model produced by a Chinese company. People are interested in whether the typical patterns of Chinese censorship are being applied to open source LLMs.
