This surprised me as well when I wrote the paper! I started data collection for the AI assisted repositories on May 1, 2025 which is the release data of claude code. The reasoning behind this is noted in the paper but can be broken down to, it would be easier to find a large quantity of AI repositories after vibe coding took off. The majority of these repos being AI adjacent topics was an interesting find, but supports the idea that a large chunk of our LLM advancements are being helped by LLMs.
Changes in Vocabulary Between Human-created and LLM-assisted Code Repositories - Taylor Lineman
https://raw.githubusercontent.com/ActuallyTaylor/strata/refs... (PDF)