This school of thought posited that government intervention is legitimate and desirable, provided the interaction of individual decisions produces a better outcome as a result. Yes, it may even be justified to replace the market mechanism. Ordoliberalism, then, is by no means an approach that is hostile to government or regulation.
At its heart, though, is the organisational power resulting from private, decentralised, individual decisions. These decisions are steered by prices. This is why a functioning price mechanism is the primary steering function. Undistorted prices provide key signals and information on the scarcity of goods, say, so that economic resources can be used to maximise welfare.