This is one form, but it is imperfect because it is misleading when referring to one person in the plural. Additionally, it is also not perfect, because although it corresponds literally to they, it also has a masculine form 'oni' and a feminine form 'one'. In the case of Adira, the translation uses the form referring to masculine groups. According to this
website there are 4 more forms in spoken language and the most common is the equivalent of the English 'it'. This form was used AFAIR by the Netflix translators in Sex Education. It is gender-neutral and its drawback is that it usually refers to animals, inanimate objects or children.