I'll take the authors interpretation instead.
"It critiques how the social construction of race and institutionalized racism perpetuate a racial caste system that relegates people of color to the bottom tiers. CRT also recognizes that race intersects with other identities, including sexuality, gender identity, and others. CRT recognizes that racism is not a bygone relic of the past. Instead, it acknowledges that the legacy of slavery, segregation, and the imposition of second-class citizenship on Black Americans and other people of color continue to permeate the social fabric of this nation."