"He was sceptical UK could achieve an open border because the other side, Dublin and EU, would not allow it"

What he was sceptical of was Teresa May saying there should not be hard border, not that Dublin wanted a hard border.

"Prime Minister Theresa May has said there should not be a hard border after Brexit, but Dublin's Foreign Affairs Minister Charlie Flanagan has voiced scepticism over the reassurances."

He was sceptical of the reassurances proffered by Teresa May.

Can you not comprehend the English language, Dublin do not want a hard border.

Unless you can provide evidence to the contrary ..........