You mean the quote Anya ? - I cut and pasted to save people the trouble of wading through a longish document.
So the border remains open, fine.
However....
If the Brexiters want to stop free movement between EU countries and the UK, how is it OK to have free movement, without even a passport check, at this, rather long, border?
So anyone getting off a ferry from Cherbourg in Rosslare, or off a plane in Shannon or Dublin, can currently walk, ride or bicycle across this border, in the peace of the countryside, without an official in site. And then they are in the uk.
And then there is the lack of customs. A lorry load of Irish beef, from north of the border, can drive south across the border to Dublin port, onto the ferry and off at Holyhead, with no more requirement than to show their ferry booking. But if we leave the customs union there would presumably be a customs check at the "open" border, with duty to pay. Then another check and more checks and duty at Holyhead. (And if the delivery was destined for Paris, more checks and more duty at Calais.
So those are the practicalities. No amount of airy fairy hand waving is going to make them disappear.
I dont have your faith in the ingenuity of those clever people roses and predict that in 12 months time, or even 24 months, they will still be trying to find a solution.
Unless of course we have a change of government that is not hell bent on the most extreme version of Brexit - that few people actually want.
Baby Reindeer - anyone watched it?