That's how I interpreted it. That EMP should have caused widespread chaos. We'll have to see the exact extent tomorrow. I was noticing in the aftermath, the wrought iron fences around the mansion were still fine, and other exposed metals. Supposedly in an extreme solar flare type EMP, such metals would vaporize or at least partially melt, so maybe Magneto was more precise in his effect. One would think intergalactic spaceships would be able to tank EMP's given that stars and other phenomena in space would also emit them, but whatever. It's comic book science.