I am not convinced your article shows an example of "poverty" not being caused by real poverty.

The examples in the article tend to include both poverty-related factors and non-poverty-related factors. For instance, certainly failing to press charges against an abusive, criminal, boyfriend is something that can be done by someone of any income level, but on the other hand, poor people are more likely to steal money (like this boyfriend did), more likely to be unable to treat mental illness that might result in violence, and more likely to be frustrated in ways that lead to violence. In this case the guy was a burglar and had no job (poverty leads to no money and people with no money and no job are more likely to burgle). Those aren't 100% due to poverty (clearly frustration at poverty is only a contributing factor to violence and the person won't be violent unless something else predisposes him to violence), but poverty affects them at the margins. Not to mention that even though each individual decision to stay with a boyfriend who has no job is technically not poverty-related, poverty cumulatively leads to a high rate of joblessness.

Poor people are also less likely to be educated and therefore more likely to make poor life decisions.

Even buying junk food is related to poverty because junk food has a lower time expenditure than other food and time has a greater relative cost to poor people than to rich people--poor people often work long hours that leave them exhausted, must spend a lot of personal time on child care, etc. Poor people also are less likely to have a supermarket with cheap non-junk food within easy commute distance. Again, none of this is 100% caused by poverty--this just raises the relative cost of non-junk food, it doesn't make it completely non-affordable--but it certainly has an effect.