Web search with diffusion process

Folks here must have read about the launch of a new AI-enabled search engine by https://metaphor.systems.

My initial impression was that they use LLMs like GPT-3, but then someone on HN said that they actually use diffusion process to generate search results - something like embedding search queries & website links in the same embedding space and running a guided diffusion.

Has anyone found any research papers/articles that describe this approach in detail?


Iā€™m interested to know this as well.