Scab is suggesting they crossed a picket line, did they ? I doubt it.
I haven't heard of any IFALPA recruitment ban either.
Given that most of them have probably come from Spanair, I would rather say

well done for finding a job.
Perhaps before you start bad-mouthing professional colleagues, you could give some consideration to the fact they may wish to eat too.
If Iberia pilots are unhappy with this development, it is to them to protest, & seek to rectify the situation, via their pilots association.
They should neither expect, nor rely on , unemployed pilots refusing job offers.
Grow up