I'm really struggling to understand what your objection is, IwantToRetire, or what your accusations of hypocrisy and self-promotion are about.
Let's look at what happened. Two left-wing, gender-critical film-makers made a documentary film about gender-critical feminism. They interviewed a number of people involved in gender-critical feminist campaigning. The interviewees were mostly, as you might expect, of the left, though not exclusively so. Many - most - of the interviewees are people who had worked extremely hard at campaigning on this issue. Some interviewees are involved in Woman's Place UK. Others are involved in LGBA or other campaigning organisations.
None of this is a secret. I didn't "give away" anything by saying the film-makers are left-wing. No one has pretended otherwise.
Lots of people who could have been interviewed for the film - Helen Joyce, Kathleen Stock, Maya Forstater, Allison Bailey and numerous others - weren't. That's how it goes. You can't interview everyone.
It is therefore completely unremarkable that Woman's Place UK would want to promote a film that very intelligently puts the case for gender-critical feminism and that includes interviews with some WPUK activists. Why wouldn't they? What would you have them do - say "Sorry, we're not going to promote this film that puts our argument very well, and includes interviews with some of our activists, because we're not in the business of self-publicity?"
What is the point of taking part in a film if you don't want people to watch it?
I honestly can't see what is making you so angry, apart from the film's title, which I can see might be mildly annoying but hardly worthy of such a hostile response.
It seems entirely self-defeating to argue that this film, which puts the case so brilliantly, should be boycotted. Why wouldn't you want people outside the movement to have the opportunity to understand what's happening?
I'm guessing you haven't watched the film. You're prejudging it without having seen it, aren't you?