It’s a lot more aggressive than what comes through in their description. It can create a giant fireball since the water boils instantly on contact and causes the burning oil to fling up into the air almost like a flame thrower.
17 second demonstration: https://www.youtube.com/watch?v=NgO_uZA5vXg
I once set oil on fire while making stovetop popcorn while drunk. This knowledge likely saved my house.
Here’s another good one with some slo-mo action. You can see it’s just a normal pot and what looks to be a single coffee mug full of water. The resulting fireball is massive.