That “news” site is garbage.
Aside from a entire section devoted to “OneObama”, they have another article there referring to the “president’s apparent white nationalist agenda.”
That's sort of how things are in a country with a lot of different groups.
When something horrible happens, people want to know if the perp was part of their own group - and then, if the victims were.
There's no evidence that the Dayton shooter was anti-Black or out to kill Black people.