indeed; we're able to make it work with SDXL thanks to a new technique that got released yesterday called LCM-LoRA.

with LCM-LoRA you can turn models like SDXL into LCMs without need for training and you can add other style LoRAs like the ones you find on civit.ai

in case you're interested, here's the technical report about LCM-LoRA: https://arxiv.org/abs/2311.05556

Yes, they are probably using: https://huggingface.co/blog/lcm_lora