No these are organizations that an EU government has granted special status to:

"The status of trusted flaggers under this Regulation shall be awarded, upon application by any entities, by the Digital Services Coordinator of the Member State in which the applicant is established where the applicant has demonstrated to meet all of the following conditions: (a) it has particular expertise and competence for the purposes of detecting, identifying and notifying illegal content; (b) it represents collective interests and is independent from any online platform; (c) it carries out its activities for the purposes of submitting notices in a timely, diligent and objective manner."

edit: Yeah, NGOs and also MPAA/RIAA style associations will probably be the most common entities.