The site writes NVIDIA is prepared to ditch the alliance with VIA if Intel allows them to make chipsets for the Atom platform:
Nvidia's MCP73 IGP chipset only supports single-channel memory and offers relatively low performance compared to current chipsets from both Nvidia and Intel making it a good fit for the Atom platform.
If Intel agrees to let Nvidia's chipset support the Atom platform, Nvidia will then terminate its alliance with VIA. This could impact Taiwan-based chipset makers VIA and Silicon Integrated System (SiS).