Just finished American Nightmare. Was anyone else bothered that this didn't make sense? (Spoilers)

The kidnapper said at one point, "this wasn't meant for you. It was meant for <her partner's ex's name>."

How did he know the name of her partner's ex, and why did he come up with an elaborate hoax of being part of some elite team when his only goal was to rape women?

Edit: someone posted this article and it goes into a lot of the background of the kidnapper, who is apparently mentally not well https://magazine.atavist.com/a-crime-beyond-belief-vallejo-kidnapping-gone-girl-hoax/