The unagi scooter has them[1]. In all honesty, they're garbage for NYC. They are somewhat of a hard plastic, and do not provide the kind of give that your want for roads which have imperfections. It saddens me that peoples first impression of micro mobility is this piece of junk that makes riding scarier and more dangerous than it would be with air tires.
It's likely possible to make a good airless tire, but I bet the materials would be expensive and I'm not sure what it's lifetime would be. Air tube tires remain the best option for micro mobility options.
yah, i'm skeptical that a solid (rubber/plastic) tire can provide good suspension and handling performance cheaply across a wide variety of road hazards, in comparison to an air tire. that's why i think bigger tires (and thicker tubes) is probably the way to go, but perhaps advances in materials/manufacturing will make all kinds of tires incrementally better.
It's likely possible to make a good airless tire, but I bet the materials would be expensive and I'm not sure what it's lifetime would be. Air tube tires remain the best option for micro mobility options.
1 - https://unagiscooters.com/products/the-scooter/ (ctrl+F "tires")