HoG: Construction Ritual does not work on Outpost

On level 2 of HoG, I attempted to use the Construction Ritual to complete all constructs. To my surprise, the ritual affects constructs like Underminer, but not Outpost.

At first I thought this was an anti-exploit to prevent players from using Prophecy followed by aggressive expansion over neutral territory, then I saw in a loading screen somewhere that the Construction Ritual was supposed to complete Outposts, and even used it as an example.