Perhaps. But it still shows that they recognized it was not as rigid as people even try to make it today within some camps of people.
That’s even with just the bare minimum scientific method of looking with eyeballs. We now have a wide range of things like chromosomes, natural hormone levels and so on that shows that even biologically speaking it’s more so gray.
However, I was not really setting up for a discussion. Just showing a quote and where it came from and answered a question about resources for the gender issues where some people, whose sex they could not determine would be assigned a gender.
Now that we have science that has explored this even further we see rabbis taking this new data into consideration and have expanded even further. This is just highlighting assigned gender existed when sex was undetermined based off of just looking at genitalia. If 2,000 years ago they had the technology we do now they would have mostly expanded much further into this issue, like they are now.