According to the document of registration in the Cadastro Nacional da Pessoa Jurídica - CNPJ (national registry of the legal entity), the signatory is legally constituted organization.
In the CNPJ, Agencia Lupa has registered "news agency" as its main economic activity. And it has six secondary activities.
The purpose of fact-checking as a principal activity is not specified. Probably because the activities follow a previous classification, defined by the certification body, and no specific item for "fact-checking" activity is included in that list. Thus, the signatory is obliged to choose an item that best describes its activity.
The "news agency" activity is at the root of the same code of "other information service activities", which seems to me to be an appropriate classification for the fact-checking service.
1a marked as Fully compliant by Sergio Lüdtke.