I'm willing to believe you are right, but not without someone finding the text to indicate as such. I do not recall this being the case, but I've only read the first two.
I checked and I don't think so. Artificial Condition includes "blending in" as someone of "indeterminate" gender named "Eden" with longer-than-short hair and longer-than-normal eyebrows, which seems to be a careful non-gendered description.