I could have drawn that diagram in 10 minutes based on the current favourite rumours. This is not a technical analysis and the term Southbridge is probably bullshit anyway as there is probably no Northbridge to start with if based on AMD x64 technology as the traditional Northbridge isn't needed as the Northbridge is taken onboard the CPU die. All in all this looks like the drawing a PC "enthusiast" would make without the full information available. That's without pointing out that there is no way HDMI output would go through the Northbridge as it would interface through the GPU and likewise the SPDIF output would run through the IO chip (or southbridge if you want to keep the incorrect term).
All in all its a pathetic attempt at getting hits with no insider information imo.







