The slander against the board is quite obvious and I believe you're being disingenuous.
So no, I still can't see slander. What is obvious to you is not apparent to me at all so please walk me through it.
People arguing from the direction you seem to be usually are big about not assuming intent... why assume intent here?
How can you prove they don't both believe they are fighting about fascism and care about that fight?
I won't go over the entire document, but it's pretty telling how they've refused to commit to "no politics" as a rule - because they want to promote theirs! The problem wasn't that sidr linked to politics, but that he linked to the wrong type. (I checked it out and I definitely don't agree with most of it. But that doesn't mean I can't defend his right to speak)
The current leaders' "lives & experiences" very much inform their work - their experience contributing to and building the project. What's irrelevant and presumptuous is assuming their race, gender, etc. make them unfit or that "people with similar experiences" (i.e. the same demographics) would necessarily lead better. The slander is in attacking and attempting to de-legitimize the board not based on their actions or competence, but on their identities. That's textbook ad hominem.
Inclusion means welcoming people of all backgrounds, not enforcing demographic quotas or judging people's fitness based on identity rather than ability. If you have substantive concerns about board decisions or project direction, by all means raise them. But leave identity politics out of it and focus on the issues. Presuming leaders can't serve the community well because of innate traits is its own form of prejudice.
The only real criticism of concern was the military contracts and a conflict of interest, which I believe is valid and needs discussion, the rest just seems like personal attacks meant to further some unrelated agenda.