I don’t even see Concordia as a worker placement game. Yes, there are workers, but you only move them when you use the Architect card, and you do not just place them anywhere, but only move them up to the number of movement points you have. Plus, then they just enable you to build at adjacent cities. They do not provide resources or anything after moving.
It just does not provide any of the functionality that I would expect from a game described as a worker placement game.


!