Specifically, the trees in the center of the picture do look like what I'd expect all the trees to look like if a wind-blown forest fire moved through an urban/suburban area. With all the embers floating in the air (especially after a building collapse) i dont see how branches survive. If the houses were not completely raised to the ground, it would be less suspect to see trees undamaged. Can it be 100% proven? no, and even a quick google search returns images that look similar (though, the ones i found had trees much farther from the homes)