Niz switch's electronic switch mechanism is capacitance. This means, there is no contact between electric conductors. The key does not need to hit bottom to activate.
Niz switch probably came out with Niz Plum 84 keyboard, around 2017.
The switch's feel came from its rubber dome, not the spring. Niz switch is inspired by the Topre Switch.
Niz switch stem is compatible with Cherry MX. So that you can buy replacement keycaps or artistic keycaps.