DMcG, the article is entirely political and dishonest.
The whole premise of the piece is that the border is under threat from the "Brexiteers."

That ignores the fact that the Brexiteers, in the form of the British government are committed, "under no circumstances" to change the Border.

The only people threatening to change it is the EU.
To make it honest you would have to change every reference to "Brexiteers" to "EU," but then the Guardian would not print it.