I don't think the semantics of the word indigenous are the important thing here, although I will say that officially, according to the Irish government, Irish travellers are an indigenous minority and attempts to discredit this are usually a thinly disguised attempt to discredit the credibility of the Irish travellers as a distinct ethnic minority - or, to put it another way, it's one of the more common ways that Irish people are racist towards travellers.

Instead, it's the racism and discrimination against an ethnic minority that we should focus on.