This is complete science fiction / FUD. Amazon can't even stop showing you ads for vacuum cleaners after you buy a vacuum cleaner, you think they have the compute for something that sophisticated?
Furthermore, the incremental benefit over traditional ad targeting via search or web history is probably pretty marginal, and not nearly worth the effort/cost. All of these scenarios (Jake Jacobs' wife, Jeff Jone, Jennifer Smith) are already going to show up in a traditional search history, why would an ad company go through all that effort to get data they already have? This is real life not a Mission Impossible movie.
Some people have big houses, others want to buy another brand, and some people love their cleaner so much they buy a similar one for their cousin's birthday.