This is a side show. Whether or not the statistics show rising or falling income inequality is irrelevant.
There is massive income inequality. Its trajectory isn't nearly as large of an issue as the status quo, which is pretty dismal.
Until that gini coefficient is much better, and we have no one living below the poverty line, we still have a ton of work to do.
This article seems to be making a shallow point only to encourage inaction on the core problem. The trajectory of income inequality is a red herring trying to distract us from the harsh reality of our present wealth, opportunity, and income inequality.
The right thing to do is to keep working to solve the core problem. Restore the US to a progressive tax system instead of regressive. Pass living wage laws. Improve the social safety net. Maybe even consider doing what Switzerland is considering, and give everyone (rich and poor) a reasonable guaranteed income as an alternative to expensive and sometimes ineffective welfare programs.
At the small scale, volunteer locally, especially anything having to do children and improving their education.
Unfortunately, along the way we will be fed a constant stream of garbage articles like this, held up with straight faces by a chorus of onlookers telling us there is no problem to fix. Look outside. There are poor and hard working people out there who aren't being rewarded for their hard work and are severely struggling. No amount of fancy statistics bending will justify inaction.