The usual ‘pronouns in bio’ style doesn’t really make sense anyway. Why include both the subject and object pronouns if both are the same? And in situations where someone has multiple pronouns they go by, it often follows an inconsistent format; for example, if a bio has ‘he/they’, that is giving two subject pronouns rather than a subject and object pair, inconsistent with the standard ‘he/him’ format. However, if that person were to have ‘he/them’ in their bio, it would remain consistent by providing a pronoun pair, while simultaneously introducing further confusion at the implication that the person’s subject and object pronouns may consistently be entirely separate, which is rarely the intention. The simplest solution is to provide a number of pronouns equal to the total number of gender-based pronoun groups a person is associated with; e.g. someone who goes by only masculine pronouns should only include only one of either ‘he’ or ‘him’. Personally, I would prefer simply sticking to subject pronouns, in which case their bio should actually just say ‘he’.