Basically the flasher-2.0.macosx (which I just wrap up) exists because of Mac users within Nokia compiling the flasher. TBH, I'm not surprised the pretty website at the front doesn't mention Linux or Mac OS X, and I'm satisfied with the more unofficial, Maemo-level, non-Nokia-branded support from the Maemo folks (although getting a Mac OS X Flasher 2.0 took too long)
I can imagine it's frustrating if you don't search, and go to the Nokia homepage but that's what Google and forums are for. I don't trust anything customer service drones say about computers ;-)