You are all falling in a fool trap. You only need your passport.Interesting report. I have an appointment for application of certificado de domicilio on Monday and have been wondering about what's really required at the appointment. I requested the appointment online, which shows a very short list of requirements - primarily the 2 witnesses with DNI and your passport: https://www.buenosaires.gob.ar/tramites/certificado-de-domicilio-para-extranjeros-sin-dni It does not say if you need to show a rental contract or other means to prove your address and there's no mention of passport translation required. At your appointment did you need to show some document about your address? What part of your passport was translated - the main page or every page in the passport?
Go to the police station and they do it without all the nazi trash from MM administration.