DY according to Rav Yosef its not intermarriage, its totally Kosher
Now I dont know what would happen if an Ethiopian decided to become Yeshivish and then wanted to marry someone from Bnei Brak which follows the Psakim of Rav Elyshiv who held they were not jewish. Rav Yosef not only held they were jewish, but was even opposed to geruth L’Chumra for them