Code ownership implies that 1) changes to that code are bottlenecked/gatekept by its “owner”; 2) code is siloed and there’s poor organizational collaboration culture.

“I am enabled to seek out the needed background and change what I need to move forward” vs “that’s not ‘our/my’ code, we can’t touch it. Let’s file a DEP ticket against that team and wait a few months”

that particular point likely refers to the fact that he prefers shared ownership: ie nobody should be “the one you go to for X part of the codebase”