I don’t like the “your ancestors had slaves” articles because they feed into the narrative of collective guilt. That’s how you get permission to engage in collective punishment.
When Victimhood Leads to Genocide - Prof. Jordan Peterson on Dekulakization
https://www.youtube.com/watch?v=DeYRK16PIlA
The point of this article is the same as the point you are making. The article is trying to show that slavery was spread worldwide in the past; therefore, everyone's ancestors participated in slave trading/ownership (and also in being enslaved). If everyone is guilty, then no one is guilty.
That is: Everyone except me, of course. My ancestors didn't own slaves:)
Kenya remains a source of slavery today. Obama’s family is neck deep in the slave trade.