I am sure this particular finnish forum often presents just fine questions related to noise, that could be interesting to discuss. It just usually won't happen over there.
Like question of lack of female presence in documentary, not sure if it is particularly good question, but it is something that can be asked, and would be very easy to answer as well. If documentary is about things that actually exists and has happened in context of theme of the document (real deal noise, not experimental sound, performance art, etc)... Then that's that.
I think the absolute core idea, that can be found from documentary as well as SI interview with director, is that it is all up to just doing it.
As encouragement, I am sure director could give even exact details what was being used. What I could mention from technical aspects, almost all live footage is smartphone videos. They are pretty damn good in quality. At least good enough for DIY documentary. Part of the interviews are that too. Software used to edit the video is free for anyone to download. If you got half decent phone, you don't need even computer. You can download something like capcut or anything like it, and you're pretty much ready to go. For advanced and higher aiming documentarists, one might want to look into lavalier mic and avoid the loud hollow room echos and distance quiet interview sound. That's like 30 euro investment and you get the broadcast quality sound.
Knowing that this is it, makes question interesting. Next step is merely the thing that is both blessing but also curse of DIY: One has to actually do it. No money needed really, just prioritizing what you spend your time with. Almost everybody has technology accessible. Also free instant distribution is just matter of signing up to video streaming service. Melun Maa should work as encouragement that (theoretically) anyone can do it.