It's like seeing certain plays from a sport team before, and then after a game seeing their notebook with their general game strategy. Yeah everything we saw before 'fits in' to what was released today - for example we already knew from examples that the NSA works to break encryption - but now we also know that it is considered one of six key investments and that it probably has its own leadership separate from the others. This is useful because you know what programs have more overhead talking to each other/partnering. For example to speculate that corporations probably aren't helping very much with the crypto breaking effort.
Wrong, the names aren't classified, contrary to your claim "the names are most definitely classified." Look in the document, the title "Sentry Eagle Data Sheet" is clearly marked "U" which according to Wikipedia
One line before the one where you've probably found that combination is just "(U) Sentry Eagle Data Sheet" clearly without the FOUO (which, if existed, would mean "for official use only"). The markings specify the following not the previous content. So the title I quoted as containing the name is just and only "U" unclassified.
As the terms are not classified there are minimal standards regarding using the names in less secured conversation. If another country has intercepted communications or documents with some mention of SENTRY EAGLE, now that this has been released they know some of the conversation/document context.
Almost correct, FOUO is a designation used to effectively classify the unclassified information from the public (really! [1]) but he looked at the wrong line.
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[1] "unclassified but which the government does not believe should be subject to Freedom of Information Act requests" (wikipedia)
(The names are most definitely classified.)