Why is it? Have you seen just how much mass surveillance the US government was undertaking in secret before the Snowden leaks? And there is no telling what other programs they are running, unbeknownst to the general population.

As far as I am aware, and someone can correct me if I'm wrong, was that the lawsuits in question were only to determine whether or not Intel were liable for making statements which were misleading or not fully revealing the details of their products. They had nothing to do with whether or not a backdoor actually existed or who funded it.

And I wouldn't expect it to. They are obviously not going to go naming individual companies, since if the document leaked (as it has done) then adversaries know exactly which companies are complicit. But "Insert vulnerabilities in to commercial encryption systems, IT systems, networks, and endpoint communications devices" is pretty clear.