I don t think there is an official no poaching agreement. Therefore if you ask around people will tell you it s not true. Most people might not even know about it.
Back in July, one of my friends got confirmed by recruitment at EK that there would be no interviews for EY pilots. That was somebody from recruitment, not flight ops, crew rostering or else.
Even if that s changed since July, one thing that s true is that I know several well qualified EY guys waiting for an interview at EK and that s not happening.