Actually, it does say that: "were specified in those requests".
Actually, it does say that: "were specified in those requests".
The number "specified" may be less than those information is provided on in the resulting report. "All devices in the US" does not specify any devices but it includes rather a lot.
In a more limited way a request for a specific users details could also include traffic information about first level contacts (and possibly more - try seven degrees and see how few requests you can make to get all the company's details).
Now a plain reading of "all the devices in America" would suggest that it specified millions of devices but the NSA like their wordplay and they might only mean when specific devices are requested rather than included in another request.
Note that Yahoo doesn't mention the number of accounts specified. Possibly they thought that might be too misleading.
[1] http://yahoo.tumblr.com/post/53243441454/our-commitment-to-o...