How does it confirm it?
In the first year following the referendum vote Enda Kenny arranged for committees of Irish and British civil servants to discuss ensuring the border would run smoothly post Brexit. In May 2017 the head of Ireland's Revenue commissioners said he was practically 100% certain there would be no need for additional border infrastructure. HMRC confirmed this and an internationally renowned customs expert Hans Maesson called the border issue a fictitious problem.
When Varadkar came to power in 2017 he disbanded Kenny's committees. He became Brussels' useful idiot. They saw a way that the UK could be kept trapped in a customs union and hence we got the backstop. If we were to be released then the UK would have to come up with more and more concessions to placate the EU. If that is not so then how would you explain the comments of Macron last November when he said Britain would only be allowed out of the backstop arrangement if they granted EU fisherman access to British waters? How is that at all relevant to avoiding a hard border?