What part of this is supposed to be the gotcha? The fact that when you have incredibly scant remains left that show some ambiguity, you will at times need to make an educated guess based on what's there in no way negates that the living person those remains belonged to had an essential, biological, immutable sex...or that said person's life was shaped dramatically by how gender roles were applied based on that sex. Just like if human remains are too degraded to extract DNA, it doesn't mean the living person didn't have genes.

Hehe, forensic investigators are sometimes at a loss to determine whether a murder occurred, this proves that murder isn’t a binary state of affairs :)