https://www.youtube.com/watch?v=jyKjADpkDLs&ab_channel=RickBeato1:21:40
Mentions that he wrote music for 3-4 songs that were on their A-list (25-30 songs) at the time. Chinese Democracy obviously ended up on the record.
Also talked a bit about working with Axl, and how he was open to ideas.
All probably mentioned in previous interviews, nothing groundbreaking.