what.a.mess.No Ireland is in the EU. We’re a separate jurisdiction to the U.K.
Northern Ireland is a part of the U.K. Because of the Good Friday agreement there are certain protocols in place that create an open border between the countries and bodies that deal with common areas (fisheries/environment/some rail & road infrastructure etc).
To close that border or put customs checks on it would risk inflaming tensions and creating targets. Therefore closing the border was a red line for Ireland and the EU in the negotiations.
Had Britain remained in the customs Union but left the EU that’s not a problem. Theresa May had a deal very close to that but to get a majority in parliament she got into bed with the DUP.
The DUP are the largest unionist party in the north. They grew out of free Presbyterian and are extremely hard right on religious and social issues are extremely anti-Dublin. They are also the only pro brexit party in the north. They sunk May’s deal on those lines betting on Boris’ promise of no border down the Irish Sea.
Boris isn’t someone you trust. He got a majority in the last election and didn’t need the DUP for the balance of that power. No customs border in Ireland was a EU red line. To get hard brexit across the line he sold out the DUP. He created a situation where NI is in the U.K. but unlike the rest of the Union in Britain it is still in the customs Union and so there is supply line and economic chaos in the north.
Reversing those protocols is the DUPs biggest goal (well alongside resisting the implementation of abortion as decreed by U.K. courts and trying to overturn a similar U.K. court ban on conversion therapy but we digress) right now.
And of course no one has a timeline of how long any of this will take to straighten out. Meanwhile, are you able to get the things you need? Is it like here where we have some temporary shortages and reduced choice of products, but we have what is needed for people to survive?
Banking on a politician to keep his word is a really bad bet.