> Not that it matters to anyone, but the Plantation of Ulster would likely be considered a war crime under article 49 of the 4th Geneva Convention.

Well, probably not, given that none of the states who were, or whose territory was, involved were parties to Geneva Convention (IV) of 1949 at the time.

I think the implication is that if it happened today it would be considered a war crime.

But that's hardly noteworthy; any internal or international conflict from the 1600s is chock full of what would be, in modern terms, war crimes and crimes against humanity, usually on all sides unless one of them simply lacked capacity.

They made a claim about the majority OF unionists, not that unionists are a majority of anything.