This article has a little bit misleading information in it. For example, the term "accelerometer" is mentioned in Hillcrest Lab's patent #7158118 filed in May 2005, claim #9, and that claim is an independent claim. All 3 independent claims in that patent must be cleared before the patent can be cleared, and I'm not sure if Nintendo can do that.
Wiimote is filed in Sept 2006, under application number 11/532,328. It then points to its parent application 60/716,937 (according to USPTO's website), which is filed in Sept 2005. That is still 4 months after Hillcrest Lab filed patent #7158118.
If Nintendo cannot clear all 3 independent claims from #7158188, then it probably has to show some engineering documents to prove when Wiimote was developed earlier than May 05. I don't remember when Wii introduced its Wiimote to public for the first time, but if it appeared in 04, let's say in E3, that info would help. Also, Nintendo's legal/engineering team must has done some patent research before Wii was released, so they probably came across patent #7158188 (even though back then it was only an application) and hopefully they took the time to document why they think their product did not infringe #7158188. Even if Nintendo turns out to loose this case, that document would cut the cost of settlement tremendously.