Yes, specifically for NJ services to Amsterdam. I don’t think ÖBB 1216 are approved there, and in any case there are not yet enough of them (will be easier when they are alle replaced by Vectrons on freight). On the day the Brussels service runs, you need a separate loco to Amsterdam from Köln anyway. It does make sense to have separate locos then.
I don’t think anyone can say yet how it is going to be once the new NJ sets run to Amsterdam. If it is easier to have a Vectron run throughout than a Taurus, then that is what will be done. I wouldn’t rule out a loco change on route though; as I pointed out, the push-pull abilities are there for other reasons.
But we are in the wrong thread, I think…