The picture is pixelated, so I am not sure what we are seeing beyond light skin. I do see what appear to be dark glasses, a nose, and possible mustache. I just grabbed several more screenshots that I will have to look at later.
If you look at the police video and pause it just as he is entering frame, then move the cursor frame by frame, very slowly, for several seconds you can see him move in slow mo, and catch him look slightly up to see ahead about 3 times. They are brief glimpses that are missed when watching the video at normal speed.
I have no doubt the police know more as they have more video, and capabilities to enhance that we don't. I imagine they don't release something too distorted as they would get too many tips. It would be nearly impossible to say much about this person in the video from the picture I captured. Maybe light skinned, but was light pointing on them making it appear that way? And if light skinned, that still doesn't necessarily mean white.