See page 4 of the report

Racially or Ethnically Motivated Violent Extremism: This threat category encompasses threats involving the potentially unlawful use or threat of force or violence, in violation of federal law, in furtherance of political or social agendas which are deemed to derive from bias, often related to race, held by the actor against others, including a given population group. Racially or ethnically motivated violent extremists (RMVEs) use both political and religious justifications to support their racially- or ethnically-based ideological objectives and criminal activities. One set of RMVE threat actors use their belief in the superiority of the white race to justify their use of violence to further their political, cultural, and religious goals. A separate and distinct set of RMVE threat actors use real or perceived racism or injustice in American society, their desire for a separate Black homeland, and/or violent pop interpretations of religious teachings to justify their use of violence to further their social or political goals.

See these from the ACLU complaining about it

https://www.aclu.org/wp-content/uploads/legal-documents/2020.06.11_Racially_Motivated_Extremism_FOIA.pdf

https://www.aclu.org/wp-content/uploads/2023/07/2023.07.27-DHS-letter_LDF-ACLU-Brennan-CCR31.pdf

When applied correctly, these labels focus on the VIOLENT EXTREMISM at the edges of a political movement not the movement itself.

You can be against Steve Scalise without wanting to shoot him. You can be against Nancy Pelosi without wanting to smash her husband with a hammer.