I obviously didn't read the article much... was mostly going based on comments. Anyway...
Upon actually reading it, they're obviously just talking infrastructure here, but that's a big deal these days with the way multiplatform development has changed. I'm thinking maybe it just isn't a good explanation of the new tools they're using. Perhaps they've got some kind of setup which is entirely independent of Microsoft's and Sony's tools. So instead of using those toolsets in conjunction as is getting more common, or using one or the other, they've gone off and gotten their own tools to work with, are building the game with that setup, and will then port from there. That's all I can think of.
But yeah, given the huge push they've had towards PC stuff (and from what I can tell, DMC4 is at the very least looking promising), whether or not they confirm a PC port of RE5 is sort of irrelevant. If they're putting everything else on PC, there's little reason to assume that one won't show up as well.