"Non-trans people assume that this “knowing” (knowing of sex, which is what some people call gender) comes simply/ logically / directly from being born female, and for most people these things are aligned."
"But for trans people, these things - natal sex- and “knowing” what sex they are (eg gender) , are not aligned. We don’t know why, but it is very possible that there is a durable biological/ development underpinning to this."
No. People who describe themselves as transgender can believe that what they are 'knowing' is that they are female if they are a male person. But that belief is not based on anything other than their own conceptualisation of what a female person is. Just because they might believe it is not how a 'male person' feels, does not mean that it is how a 'female person' feels.
This theory relies on people believing that the impossible is not just potentially possible but absolutely materially real.
And the constant plea to authority of 'but it is very possible that there is a durable biological/ development underpinning to this" is leveraging a miniscule chance that in the future that some transgender people will be discovered to have something materially identifiable to diagnose their categorisations.
However, that will be highly unlikely to apply to the vast majority of people who currently claim to be transgender.
So, again this plea to authority lacks credibility and has the very potential to unravel a very fragile web of falsehoods. But, I do hope that this discovery is found and found very quickly because it will then start a reasonable discussion about what that specific group of people need.