Talia is explicitly identified by her creator as Arabs/Chinese mix. Ras was ambiguous on purpose but nowadays we accept that he is Arab. It's also more tricky with characters of Arabic descent since Arabs can easily 'pass' for white and getting into the debate of whether some features are more or less Arabic is it's own problematic mine field. Plus in that part of the world and in South Asia, most divisions are due to differences in culture, language and religion with occasional colourism than due to race.
There is also the fact that the Al Ghuls are basically a nomadic cult not associated with any of the real world Arabic or Asian countries so how is Damian supposed to rep his culture anyway?
I think Damian and Kyle should be in a category separate from Dick, Selina and the rest of the 'poc only when convenient to certain debators'. Damian and Kyle should be representative of people who are poc but can pass for white.