A nice article. Sadly, some (maybe only a few, I hope) trads here are racists, and as such they will be upset that a Black could become a saint. St. Martin de Porres was, above all, humble. He had great humility. That's something that trads could learn from, but sadly, probably won't happen.
There are several saints in the Eastern Catholic churches
Although St. Moses the Ethiopian aka St. Moses the Black is a popular saint, St. Mary of Egypt may be considered to be a black saint.
St. Moses was a former highwayman. He had a gang of thieves who murdered and stole the possessions of travelers. He and his band raided a monastery thinking to steal their food and treasures, but they offered him hospitality. He converted and became a monk, and then was elected abbot. When his monks informed him that a band of thieves was approaching the monastery, and urged him to hide, he refused, told his monks to find a way to safety, and then willingly accepted death in repentance for the horrible crimes he had committed in his own youth.
There are many other Black saints. The Ethiopian eunuch baptized by St. Philip is one of many saints.
https://www.ncronline.org/blogs/ncr-today/black-saints-ethiopian-eunuch