Seems to me like the point of the article that OP linked is that the word Tribe might not be ideal to use in a certain context, which is when speaking about African states and societies, or also to an extent when talking about communities of Native Americans and so on. I can't make the jump to the usage of tribe in the bunq app to be offensive, though. That would just mean that you cannot use the word "tribe" in any context whatsoever.