I have to disagree with the headline. The "intelligence coup of the century" came much earlier, during WWII.
The Allies were reading a good deal of both Japanese and German encrypted communications. This saved the lives of many Allied solders and, perhaps, tipped the balance of the war.
In terms of scope & scale you may be underselling the title. Enigma, while perhaps more far-reaching in its consequences for computerization, did not have consistent application its breaking would suggest. American code-breakers had more success against the Japanese in practical terms, Midway most especially, but the imperials were a doomed effort[0]. As the cliche goes, British intelligence, American steel, and Russian blood, all of which overshadowed by the Bomb.
To put it bluntly, the equivalent would have to be, say, informing Stalin about Barbarossa, or cracking Purple before Pearl Harbor.
What the article describes, is the most thorough and long-running (known) intelligence operation in modern history. It is simply unparalleled in strategic depth and tactical implications, not to mention how it must have shaped global politics, economics & social development.
The Allies were reading a good deal of both Japanese and German encrypted communications. This saved the lives of many Allied solders and, perhaps, tipped the balance of the war.
https://en.wikipedia.org/wiki/Magic_(cryptography) https://en.wikipedia.org/wiki/Ultra
David Kahn's book, the Codebreakers, is a good introduction to cryptography and has a lot of this history in it.
https://en.wikipedia.org/wiki/The_Codebreakers