I'm not sure how anything beyond your opening accusation is supposed to contradict what I've said. The party that was unable to reconcile its position with respect to the new border and the Good Friday agreement was the EU, not the UK.
This entire sentence is a lie. The UK wanted a "magic invisible border" on the island of Ireland. The EU explicitly wanted no border at all on the island of Ireland.
If you're not sure how that contradicts what you said, then I'm sorry that your English comprehension education failed you.