Earlier quoted context omitted.
Who knows how many thousands of pages they need to read and understand? Also, don't underestimate the difficulty of a reporter understanding these thousands of documents sufficiently to recognize when one is really important.
If they don't understand what's going on, wouldn't that argue in favor of doing more detailed research and analysis before writing claims? The original assumptions/claims in the Guardian story on PRISM are now shown to be false. This caused a lot of negative blowback on the companies involved. Don't we expect our investigative journalists, to well, actually investigate things, instead of rushing to print?
In other words, NSA used court orders to access data with the knowledge (but gagging) of the companies (PRISM), while at the same time also hacking into the companies to access data without their knowledge (MUSCULAR). These things were both true.