Target audience is FOS developers that are bothered to come to a conference for FOS developers to find out stuff about FOS projects.
Thank you for all the work you've put into this. I'm not fully sure about the target audience you have in mind for this material. Anyway I wrote a list of comments for the document you shared. They are opinionated, maybe based on my wrong assumptions, but not intended harshly.
https://www.figma.com/design/EQGGzqihPjtkoLoaZU4Pbw/Nostr-Poster-(Copy)
I hope at least some of them will be helpful for you.
Discussion
So general Fosdem audience. For that crowd I would go with much lighter content, selling the concepts on more abstract level first. The tech savvy people will dive into the details by themselves, but only if you spark their interest first.