Yes. The discount was never really intended for foreign residents, but Spain had no choice, because you cannot discriminate against citizens of other EU countries. With Brits being out of the EU, things are different now. Maybe time for M&T to look for Irish heritage
I understand that years ago, the discount indeed applied to everyone living on the islands no matter the citizenship, but this got tightened following one of the financial crises.
Wife and I have had nie for almost nine years, we had issues originally with our children's nie due to non apostled birth certificate. We kind of drifted on without children's nie fir a few years until they were absolutely necessary for school trip. We recently applied for our TIE cards not knowing there was a five year stipulation. Picked our new TIE cards up recently wife and me have permanent, children's are temporary Had we known and delayed our initial application by nine days children would have had full TIE. Hey ho