James II wasn’t king of england until 1685. how could he have enslaved the irish in 1625?
There were a large number of Irish who were sentenced to "transportion" to other areas (colonies, Australia). Often, it was 7 years. Those who were transported had to pay their own way so they were in debt. "Indentured servants" basically.
Barbados and Montserrat are the two most well known places outside of Australia were the Irish were sent. Montserrat has a significant mixed Irish-Black today. It was complicated there as with everything else. You had Irish plantation owners there along with Irish indentured and black slaves.