predicted shortages in staffing
Predicted my a*se, mate!
Staff shortages still are and (more or less) always have been an essential part of european ATC life.
A few providers have been recruiting expats for over a decade now, especially Skyguide of Switzerland and DFS of Germany.
Staffing levels have improved, but generally shortages are still the norm (if I'm not mistaken about 1500 all over europe).