I received a Google alert for this website, which is clearly labeled as Joule Thief. As can be seen, the circuit shows two transistors. a single winding coil and a few other parts, which are indicative of a voltage boost circuit but definitely not a conventional Joule Thief.
Some people accuse us of being pedants. Look, all horses are four-legged animals. What would you say if I called that four-legged animal laying on the couch and purring, a horse? What you say if I called that small four-legged animal wagging its tail a horse? Not all voltage boost circuits are joule Thiefs, and unless someone challenges those who make this mistake, those mistakes will continue to happen.