Earlier quoted context omitted.
Well, it's the UK's obligation to preserve the Good Friday Agreement. The legal technicalities of that are debatable, but let's assume for this discussion that there exists a clear legal obligation to do so. Which specific obligation(s) under the GFA do you think would or would not be satisfied by which specific proposal(s) that have been made in relation to the NI/Ireland border?
Well, I guess the IRA had always had a legal obligation not to kill people. It hasn't stopped them. Maybe the view needs to be widened a bit.
The comment by blibble that you replied to was about a question of sovereignty, and both the summary of why the ERG don't like the proposed WA and the likely consequences of that seem reasonably accurate to me.
You seem to have introduced first the GFA and then the IRA into the discussion, but without explaining why they were relevant to the original point. Can you clarify what argument you are trying to make here?