It is understood that people attached to the Military Industrial Complex or close the Military Industrial Complex should be able to participate in NixCon, whether as organizers, speakers, or attendees. Their attachment to the Military Industrial Complex should not be taken against the individuals.
This is a bit of a "separating the art from the artist" issue. If some person works for MIC, they're part of the problem and they deffo shouldn't be allowed to participate. So I'd say this letter isn't fully being against MIC involvement, however, it's better than nothing. At least the direction is more correct than just accepting MIC sponsorship quietly.
Perhaps this has some effect if it gains a significant amount of signatures.
BTW: There is also a clowny NixOS Users For Western Military and Governments Support which hopefully gains no support, but hey, at least the imperialist lap dogs are outing themselves.