I was reading a thread on reddit earlier where a few gay men were discussing transmen in gay spaces. The consensus seemed to be that while they are mostly welcomed into gay spaces (because there's no particular threat to the power dynamic so inclusivity tend to win out). They tend to hang around the fringes then quietly drop out because as the men put it, gay male culture is complex, fast and can be quite brutal - not at all like yaoi slash fiction imaginings that's taken hold in a lot of online spaces. A lot of actual gay men can find it alienating and difficult to navigate when looking for something meaningful so I can't imagine anyone female will fare particularly well.
No idea how much this applies to Freddie or whether they have genuinely attempted to live as a gay man immersed in that culture. It just strikes me that a female idea of living as a gay man is as much fantasy as the male idea of living as a lesbian. I think this is why we see quite a number of same sex trans people in a relationship but identifying it as the opposite of what it is (e.g. two females identifying as a gay male couple).
Seems like extended role play to me perhaps driven by a deep disassociation from expected gender roles based on biological sex. I don't think it necessarily follows that someone like Freddie is a lesbian because they attempt a relationship with another TM. This is why good therapy is needed and not unthinking affirmation.
I really hope Freddie is able to have a good relationship with their son but my biggest concerns would be that the child is at risk from being transed themselves if he so much as looks at a pink toy as a toddler. If they do manage to reach puberty as an average boy child how is Freddie going to deal with a young man who masculinises effortlessly due to puberty and will probably tower above them by age 15/16.
There are so many real issues that need to be asked in documentaries like this rather than the sanitised, unquestioning, sappy music version we get.