Yes, if you or your spouse have an Irish passport you can enjoy the freedom to travel in the EU that we all enjoyed before Brexit. In fact, if either you or your spouse have an Irish parent or grandparent I believe that you can apply for an Irish passport, but it can take up to two years. This applies to either NI or Eire parents/grandparents. However, I have heard reports of problems with EU immigration due to their lack of awareness of the right for the spouse to benefit from this ruling.
For your information, I contacted the mayor of Santiago last November with reference to the 90 in 180 rule and the effect it is having on UK "Swallows". He was extremely supportive, unlike my British MP. I also contacted the British Consul for the Canary Islands. She too was supportive of the move to change the 90 in 180 to 180 in 360, the same as the UK offers visitors from abroad, but it has become clear that the UK government has little interest in the Shengen rule on the basis that we voted for Brexit to
prevent freedom of movement. So it is entirely up to Shengen member states to make individual arrangements for visas allowing Brits to visit the EU for longer periods. But, unless the Shengen rules are changed, the 90 in 180 rule will still apply across all other Shengen member states cumulatively.
In case you are having trouble getting your head around the Shengen calculation, the following website may help you.
https://www.visa-calculator.com/