But what about the biology?
Four words that are not synonyms. Ancestry is a fact about descent, and it is real at fine grain. Nationality is a legal status. Ethnicity is a claimed shared history, language and practice. Race is a scheme for sorting bodies into ranked kinds. Only the last one is under attack here.
Not biological does not mean not real. Race has no foundation in human biology and enormous force in human affairs: it has decided who could enter a country, own land, attend a school, marry, or be believed by a doctor, and those decisions leave measurable marks on health and wealth for generations. Anthropologists call race a social construct in the sense that money and borders are social constructs — invented, agreed upon, and entirely capable of ending a life. What this section denies is that the categories carve nature at its joints. It does not deny that they matter.