They were able to hire Permanent Residents, but failed to mention in their ads that they could also hire a narrow subset of asylees and refugees who are considered US Persons despite not being Permanent Residents. (EDIT: I think the definition of "protected individual" at https://www.ecfr.gov/current/title-22/chapter-I/subchapter-M... is the relevant one.)
Our jobs are in a different category that is limited to US citizens.