Cheers for the link but I couldn't see any mention of GTA V there. (Article was dated 5th October 2011.) Perhaps I just misread what you were trying to say though.
For me, in that post, Rockstar confirms they have no intention of abandoning the PC platform and will be releasing Max Payne 3 and LA Noire but not RDR.
They cite technical, developmental and business decisions in the viability of producing a game for a particular platform and why RDR won't likely be getting a release. As the news was a month before Rockstar officially announced GTA V then I don't think they are referring to that at all.
Hopefully we won't have to wait too long for a PC release. I never doubted GTA 5 will appear on the PC but I'm not hopeful it'll be released at the same time as the Xbox and PS3. I love my GTA though and just hearing about GTA 5 makes me want to reinstall and play them all again.