It is curious to me that it seems okay to defer to the author's assumption that Satoshi is a singular person, while at the same time denouncing how they refer to that person. You are okay with one uncertain assumption but not another. I think if you are willing to defer to the author here that benefit of the doubt should extend to the rest of their writing.

However, if we assume that Satoshi is a singular person, how do you suggest we refer to pseudonymous individuals whose gender and identity are unknown? Again, is it acceptable that I insist on referring to you as she/her without knowing who you are?

Assuming that it is the chosen, gendered name-on-the-internet that matters, if I were born biologically male but then undergo a sex change procedure and then and adopt a feminine name like Jane Smith in my work, would it be acceptable in your eyes to refer to me as she/her by default? Surely in this case, he/him or they/them would be unacceptable, if I follow your logic correctly.