You're cherrypicking and misrepresenting what I've said.
I'm specifically referencing the Troubles which was and is NOT an anti-imperialist/colonialism conflict at all. The very fact it has been mentioned in this thread shows those who've done this do not understand the origins or what it's based on.
The origin goes back to 1880s when Nationalism and Unionism first emerged. It was comparative with the rise of nationalism across Europe. By the 1920s, the question was on self-determination which again was comparative with the European experience.
But the Troubles itself wasn't a case of colonisers v anti-colonisers by any means. It IS very inappropriate to shoehorn it into a thread about colonialism and slavery.
The history that IS more relevant to colonialism and slavery is early Irish attempts to conquer other lands and colonise them. The most successful of these was obviously Scotland whose name means "Land of the Irish". Before the arrival of the Irish, it was populated by the Picts with a Pictish language and known as Pictland.
St Patrick is the most famous person taken by the Irish as a slave today. There were others.
A rather more inconvenient fact and relevant to the thread is the role of the Irish in the British Empire. Along with the Scots, the Irish spread the Empire further than the English managed to. These two groups were famed for their fighting skills and made up a bigger proportion of the British Army since 1600s or so than other parts of the UK did.
It was an Irishman from Down who burnt down the White House too.
But the Troubles history itself was not part of this. Especially since history is not one long unbroken chain of causation. History ebbs and flows. One historical event doesn't necessarily impact on another.
Attached is Professor Walker explaining most of the above. He noted the same with Unionism, but I can't find my screenshot of this just now.
The difference with the example of South Africa given is there was majority consensus there since that society was hugely imbalanced. Northern Ireland is very significantly different from it as we never had majority to that degree and our peace pacification process is very different to theirs as a result.
South Africa was an example of colonialism. Northern Ireland was not.