there's also this interview here:
SPOnG: A couple of years ago, you guys showcased Alan Wake on the PC and it looked pretty amazing with the use of multi-threading and taking advantage of multiple cores. But recently you announced that the PC version has been canned. Why?
Oskari Häkkinen: Well, we're a relatively small studio with about 50 people, so it just made sense for us to concentrate on one platform at a time, and see how it goes. Nothing to announce today regarding that, but right now, we're just focused on the Xbox 360.
http://spong.com/feature/10110062/Interview-Alan-Wake-Remedys-Oskari-Hakkinen
He never denied those ss being from 360 only.