"the archaeologists will be able to tell your gender" but archaeology is not merely a dry study of skeletal remains.
https://www.history.com/news/viking-warrior-female-gender-identity
Were these individuals regarded as male within their lifetimes? Answer is basically "we don't know enough about Scythians and early medieval Scandinavians to say."
Archaeological record validates historical transness AND/OR other societies not having our hangups about carefully defining gender by how your crotch looks.