While there's plenty about AT Protocol/Bluesky I find un-ideal, in this case I believe Paul is referring to the aspect of the protocol that allows you to build your own algorithm to curate posts.
For example, there's a 3rd party Bluesky web client called Skyline that allows you to curate your feed like so: 
I think it's great to allow users themselves to tune their feeds the way they want, and I'm sure is something we'll be seeing in nostr clients too.