Similar but different

I'm sharing another Youtube video from Jesse the Karate Nerd. In the Bujinkan we have a strike called a Tsuki, it is based on a sword or spear thrust, so that it matches our weapons training without modification. It is often said that no one punches like that anymore. And it is true, very few use a punch like a Tsuki anymore. However, this recent video shows a punch that is similar, while still having many differences. But the core idea is the same, using a unilateral strike to deliver a powerful blow without having to waste too much effort or energy such as one does with contralateral punches. Enjoy. Also, what do you see as similarities and differences between this body jab in the video, and a Tsuki with Fudoken?