You will say any stupid thing to avoid admitting a mistake won’t you? Since when does any politician make specific statements? The governor came as close as a politician could to saying defective wiring caused the fire. It wasn’t arson, or that would have been stated. It wasn’t a hate crime or negligence or the pro-black website the article is from would have said so.
Occam’s Razor, “the simplest explanation is almost always the correct one”, there is no indication that anyone at the time, or even now suspects foul play. Given the time and age of the building, it almost certainly had “knob and tube” wiring which is very susceptible to damage and defect. The wires aren’t insulated, just mounted on porcelain insulators (hence the knob). The tubes were also porcelain as well and used to insulate the bare copper wires when they penetrated walls. Short circuits were common as were broken knobs allowing the uninsulated wires to contact flammable building materials.