Obviously the writer of that article twisted facts to make it appear tribal; that the Igbo parents are tribalists. That's not the fact! What we have here is a big cultural difference: Igbo culture abhors out of wedlock or unplanned children. Yorubas may accept this as it's very common in yoruba culture but it's virtually non existent in Igbo culture; if it's, it's negligible. The boy's parents see no problem with this but the Igbo parents see it as a big/capital problem.

Two, I don't know of any Igbo man that will give out his daughter to a man irrespective of tribe or race that is not financially stable, responsible or of good character. I personally will not. If you read the article, the girl's father kept saying " I don't want her with that boy." Indicating something about his character. He didn't say " I don't want her with that Yoruba muslim." Again, Igbo culture is a well organized culture with strong emphasis on family structure and zero tolerance for out of wed children or unprepared men getting into marriage. I know it's not unusual to see yoruba men getting married while still living with their parents or supported by them. This may be accepted culturally by Yorubas, fine but Igbos don't allow that. Igbo culture accepts of men getting married only when they are independent and can take care of their wife and kids without outside support. There may be exceptions for first son, first daughter, e.t.c.. That's why an average Igbo man marries at age 35. I think Yoruba is 25.

This has nothing to do with tribalism. If you are non Igbo man and want to court or marry an Igbo girl, you must know the culture and do things accordingly. If you are Yoruba, ask FKK, Davido, Gov. Akeredolu and co, these are also Yoruba men married to Igbo women. Show the parents you are prepared and can take care of their daughter yourself and not asking them or your parents to take care of your seed(her pregnancy), that's been irresponsible and Igbos don't tolerate such nonsense. You put a family through pain by your irresponsibility, then blame them for killing her? How do you expect the man to respect you or accept you as a suitor when you can't even take care of her pregnancy? If It were me I will lock you up after warning you to stop seeing her. Stop pissing people off!

Source
https://www.nairaland.com/5623525/amaka-nweke-parents-beat-daughter

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Agreed with all your narratives. But still doesn't justify them maltreating the child to the point of death.