Critical thinking is good, whether one agrees with the conclusions or not. As a math instructor, I'm well aware of the split between the STEM and Liberal Arts wings of academia. The former offers methods by which we can verify or falsify hypotheses, while the latter offers competing paradigms that stand or fall on the strength of rhetoric, only to be resolved (if we're lucky) in the court of public opinion over many generations.

It's clear from various measures that being Black comes with a great many negative trends / outcomes in our society; thus, systemic racism is a serious problem that must be addressed. The debate between reformists and revolutionaries is ongoing and at least a century old.

My biggest problem with DiAngelo's work is what you stated in your final paragraph: that she's a White woman offering her take on racism and its remedies, and thereby gaining a great deal of income and intention for herself. So I've never bought her book and take her work with a grain of salt. I'd rather spend my money and energy on the works of real Black writers of the past and present. Some of my favorites are James Baldwin, el-Hajj Malik el-Shabazz aka Malcolm X, Cornell West, et al.