It's been in https://kaleidoscope.readthedocs.io/en/stable/plugins/Kaleid... for a while (as in, it's a plugin you can include in your custom open source keyboard firmware, with both 2x2 and 3x3 modes.)
A few days later I wanted to add custom macros and had to read the docs. Skimming the warp section made me realize it's basically just recursive space positioning. I tried the mode again, and soon realized how incredibly useful this is.
It's a bit difficult for me to keep the state in my mind when going down the tree because there's no visual indicators. It's a keyboard firmware after all.