The article clearly mentions that the xbox is still going to use PowerPC, and the playstation may mod the x86 processor.
And even if ps3 does leaves the processor as is, the OS they are going to use is not going to be windows. Perhaps a variant of Linux of some kind. This may mean more games on Linux (however highly unlikely), but definitely no new games for Windows PC.
I think you missed the point. The point is that if the processor is x86 based and the GPU is basically an off-the-shelf AMD GPU, porting the code from PS4 to PC will be a much easier process than it is today and make help game makers provide better feature parity between the console and PC version.
And even if ps3 does leaves the processor as is, the OS they are going to use is not going to be windows. Perhaps a variant of Linux of some kind. This may mean more games on Linux (however highly unlikely), but definitely no new games for Windows PC.