No, it is not true.
When Aer lingus proposed the opening of the BFS base IALPA strongly opposed the T&Cs imposed by the company. These included no union representation, no seniority, promotion on "merit", no right to transfer to DUB etc.
After 2 threatened strikes and 5 months of very arduous negotiations a much better deal was achieved and this is the template for other bases outside the ROI.
The key characteristis of this template are: All new entries join a global seniority list and all promotion will be in accordance with this list. All pilots have the right to transfer to ROI (DUB &ORK) on ROI T&Cs after a 5 year period, retaining their global seniority position. They have the right to join the ROI DB pension scheme on transfer and transport their existing DC pension to buy service.
Some of the T&Cs are better than ROI e.g. 5/3/5/3 roster, others are worse e.g. pension. However, a DB scheme like pilots in Ireland have simply would not be possible under UK legislation.
Right to union representation.
The T&cs of Aer lingus pilots outside ROI have a long way to go yet in terms of improvement and IALPA are already engaged in pursuing these improvements. However, they are much better than they would have been had IALPA not taken the action it did. And they stand a much better chance of further improvement as a result of that action.