Sigh, so we've got an official SC response, here: https://discourse.nixos.org/t/statement-on-a-steering-committee-member-joining-anduril/69007
As the response correctly points out, there are two problems here: the failure to update on CoI and the Anduril employment.
CoI is a serious issue. Tom has informed the SC in advance - that's good! But SC has failed to inform the community. I'm not sure how a "living document" is relevant to that - SC provided many updates to the community via Discourse. A Discourse post would be perfectly fine here, too. The response doesn't address why the post was never made, though?
For Anduril employment, though... Anduril sponsoring NixCon last year has contributed to community split. An open letter was written, and many prolific contributors (including present SC members) commented against Anduril: https://discourse.nixos.org/t/should-organizations-relating-to-the-defense-sector-being-able-to-sponsor-nixos/41252?u=kfearsoff
Furthermore, when running for SC, there was a question about MIC sponsorships. Many rejected them. So I don't think it's unreasonable to expect SC members to have a problem with Anduril.