Where
Where did you see an advert for Fast Track Commands??
I don't believe they are advertising such a position. Vacancies currently being advertised are FO and A330 Captain.
They may be suggesting upgrades will come faster at EK than your current company. I guess "Fast" depends on:
1. which fleet you go to, expansion and resignation rates at EK, and
2. your perspective. For some, 4 years is fast, for some 10 is fast....