The advert said that they had 767s joining the fleet. It's about the millionth time that they have said they will be getting 767s and they never appear despite various promises and the charterers of FJE flights wanting a larger aircraft. You can never get all of the bags on a 757 on the flights that FJE do.
And as for the rest of the positions advertised in Flight this week they are not needed because FJE is expanding but instead because so many people have left. I'd heard from friends who are still there that the two head pilots had resigned and I guess those are the jobs advertised in Flight.
Flyjet is a mess of an airline. Steer well clear.