I always wonder about such publicity, is it info ops and necessary?
Not 'info ops', an entry-level recruiting effort by GCHQ. But the bottom line is that the case study provided on the website is extremely generic and does not compromise anything. Far more detailed and interesting information is in many publications readily available to the public on the subject. The website provides just a bare bones outline, not a discussion of sources and methods, and only hints at the multidisciplinary integration of intelligence. But the 'necessary' bit of the question can only be answered by GCHQ: How are they doing in attracting the type and quality of people they require to be effective in targeting existing and emerging communications?