This seems at least a little unethical. At the very least, I would think worse of a company that sent a video to me that seemed personalized, but later turned out to be mass-produced. He has an ethics section in the article, but doesn't doesn't go very deep and (unsurprisingly) concludes that his own actions were perfectly fine. The root of the problem is why customers respond well to these videos: they're surprised…
> I think that "if we were honest about this, customers wouldn't like it" is a good litmus test for whether you're doing an ethical thing or not.