Right so the author of the post in question, is in favour of Nix taking sponsorship from Andruil, or against it?
They are partially writing an opinion piece, but not about their opinion about working with the military. They are writing about Nix leadership vs Nix community.
https://www.theregister.com/2023/09/08/nixcon_drops_anduril_...
There was also a longer discussion on HN 7 months ago: https://news.ycombinator.com/item?id=37418351
The reason that Anduril was dropped as a sponsor for the 2023 EU conference was that the venue wouldn't allow the association. This time the NA venue did not have that policy, so the sponsorship went through.
I mean they even have their own independent build system?
There are also concerns with regard to civil liberties such as spying on their customers out of self-interest and on behalf of the US government, cooperating with authoritarian regimes such as China or their participation in Trusted Computing. Also note that while nowadays, just like many other tech companies, Microsoft might get criticized as being 'woke' by people with a certain political outlook, in the late 2000s, they were throwing people off xbox live for mentioning being gay in their profiles (or just having the surname 'Gaywood', for that matter).