First MultiArch as stated in the article is a long term goal of the entire project and everyone involved. The package maintainer just wanted time to review the code to ensure it met the standards for a package that basically controls the stability of the entire distribution.
Second, managing a process and people involved in that process is HARD even in commercial environments where you can tell someone what they should work on. It's even harder in environments where you can't tell someone what to do because they are a volunteer.
The package maintainer was right to want stability in dpkg and the technical committee was also right to want to move the code forward as it's a critical part of MultiArch. So if they are both right the trick is to bring about a solution that recognizes that and works with the process, that's HARD. As the article says the tech committee issued an ultimatum so the package maintainer made time for the review and got the patch merged. The process worked and in particular worked on a project with true democratic control and a mostly volunteer workforce. To me that's a direct indication of the dedications of the Debian maintainers. I think the only possibly negative thing this really indicates is that Guillem needs some more help (or needs to trust his helpers more) but DPKG is one of the most critical pieces of the Debian toolchain so I understand his caution.