…in The New York Times.
IBM mainframes, like other mainframes, actually are of course digital and everything they do is part of “the digital world.” Indeed, IBM’s entire history, going back to the pre-computer punched-card days, is all about digital information processing.
“Digital” is not really a synonym for “cool modern stuff,” any more than “analog” is a substitute for “old-fashioned boring stuff,” but journalists generally seem to use the words that way.
(In the case of the linked article, I suspect that the article-writer and the headline-writer are not the same individual. LinkedIn made the headline even worse by changing it to “IBM Evolves to Serve Digital World.”)