How is it that you seriously think that anyone else is using a T&L unit like the one in GeForce 256 in a modern mobile GPU? No one has been using fixed function T&L for several years to begin with. Your argument is self defeating.
I couldn't say as I'm not privy to the design details of products which nVidia alleges infringe on their patents. However, that's what they've claimed, so a refutation of that claim would have to necessarily include a comparison between the patent claims and the products that are alleged to infringe on those claims.
For all I know, the products don't actually infringe, it's just that nVidia thinks that they do but are incorrect in their own thinking. I'm not attempting to claim one way or another whether or not nVidia is correct or justified in their actions. The only thing I'm doing is pointing out faulty reasoning on the part of other posters who have some misunderstanding of how patent law works that are leading them to make those kind of claims that are based on their own opinions rather than a more objective assessment of the situation.
While it's probably unlikely that anyone is using decade old technology, they could very well be using some derivative of that technology that could still be considered to infringe on nVidia's patents.