Apart from the dubious claim there, why would anyone prioritise a line to an area served by a railway station?
WHY would CEC propose a project that goes into a neighbouring council that is more interested in building roads??
Mainly because it will serve the sorts of large institutions (the University, Royal Infirmary, King's Buildings (just about)) that would be ideal for a tram network (and several people argued would have been a better Line 1 than the airport/Edinburgh Park). It also fits with development plans to help "unlock" the BioQuarter development and all that land down there.
Folk don't seem to want to use the train for short trips. Hopefully they'll prefer a tram.