Agee was higher up in the intelligence hierarchy than Snowden and the MINERVA secret, while a fairly big deal, is not nearly as big of a deal as 'NSA can break some kinds of modern crypto' would be.

More importantly, I think you're misreading what the new writeups on this story say about Agee's knowledge. He doesn't mention MINERVA and didn't know anything about the BND-CIA joint infiltration of the company. Here's what he writes in Inside the Company:

The National Security Agency cannot break this code system mathematically but they can do so if sensitive recordings can be obtained of the vibrations of the encrypting machine when the discs clack to a stop. The recordings are processed through an oscilloscope and other machines which reveal the disc settings. Knowing the settings, NSA can put the encoded messages, which are intercepted through the commercial companies, into their own identical machines with identical settings, and the clear text message comes out. Although the Swiss manufacturer when selling the machine emphasizes the need to use it inside a sound-proof room on a table isolated by foam rubber, we hope this particular code clerk is careless. If we can discover the settings on this machine in Montevideo, NSA will be able to read the encrypted UAR messages on the entire circuit to which their Montevideo Embassy pertains.