A disagreement over the PostgreSQL trademark

Indeed. I dug a bit further, he has in the past also called for a change in the way the Core Team works.
https://postgresql.fund/blog/is-it-time-to-modernize-post...

Trying to force their hand via a trademark dispute seems misguided, almost guaranteed to fail and will just waste resources. Seems like a lose-lose situation. Did he make any attempt to raise these issues privately?

I think he raises some good points, particularly that the Core Team does not have a legal body and PGCAC, the most important organization, actually answers to its own board, not the Core Team.

And that transparency in these orgs seems lacking. Funnily the PostgreSQL Core Team page states "Starting in 2019, the Core Team are aiming to publish regular activity reports", and that was the first and only report ever published. (https://www.postgresql.org/developer/core/)

I'm an outsider so it's guaranteed that I'm missing some information.