Yes, because 360 and pc's work exactly the same and in no way have different servers or software.
But, The 360 version is most likely just a port of the PC version which means that, the PC version should be ready to go.
I mean come on, all development is done on the PC and steam is based on the PC, it makes no sense for them to put more effort into the port.
Not to mention, this is a demo, it isn't the full game, delays on demos should never happen.