In signing the GFA, the UK effectively gave up on it's sovereignty over NI. That was never going to happen through "peaceful and democratic means"
Look at where the border is, the separation has already happened to a very significant degree.
It's difficult to make out if this is ignorance, a poor attempt at satire or simply trolling.
The border is in the North Channel today, so the bit about sovereignty clearly holds up.
Are you saying the GFA would have been reached through peaceful means?