I made a mistake. Sorry.
Dublin's Foreign Minister did not "express reservations" he "voiced scepticism "
Not much difference.
He was sceptical UK could achieve an open border because the other side, Dublin and EU, would not allow it.

EU is threatening a hard border. Dublin is with them. Undeniable fact.

UK says it does not want one, but Dublin's foreign Minister "voiced scepticism."
Why? Because it can not stop EU imposing one, just to punish UK for leaving.
Undeniable fact.

As I accurately stated, "UK does not want a hard border Jim, just Dublin and the EU"

Britain does not want it, but EU does.
The Republic is part of EU. What EU wants Dublin has to want too. Members of EU can not decide how their own borders are controlled.
Undeniable fact.

All that nastiness achieved nothing.
You lose again.