Could be that as you will be joining as F/Os at the bottom of their seniority list they consider you have too much experience. I don't know about now, but when I worked there they realised the time to command was increasing and were getting fed up of experienced F/Os pestering them about when they would get a shot at command. Consequently they like to take on 200hr guys who will sit there for several years before they have enough flying experience to even be considered 'qualified' for a command shot.....
PP