ANY cis, nb, or trans lesbian can go by he/him if that’s what makes them comfortable. Lesbians have been doing this for decades and to suggest otherwise is ahistorical. But the historical precedence doesn’t even really matter! It costs zero dollars to mind your business, and let lesbians use the pronouns that they want!
It doesn’t matter why they decide to use he/him; no one has to give you their life story to justify themselves.
He/Him lesbians are wonderful and don’t have to say shit to anyone who questions their personal reasons for using he/him!! End of discussion! It’s not up for debate!