That seems like the crux of the entire tiff, and without that knowledge it's very difficult to discern which side is more reasonable.
Edit: Honestly, some of the initial commits to the new repository are more in line with Liles' account: https://github.com/jackaudio/new-session-manager/commits/mas...
Starting in April 2020, changes include:
- Dumping the timeline, sequencer, and mixer: https://github.com/jackaudio/new-session-manager/commit/80e9...
- Removing any thing with logos or icons, e.g., "filing the serial number off": https://github.com/jackaudio/new-session-manager/commit/7992...
- Enable debug mode / verbose mode by default: https://github.com/jackaudio/new-session-manager/commit/3975...
- Change project build system over to meson: https://github.com/jackaudio/new-session-manager/commit/e431... (plus others)
- Update build system to exclude current GUI / make it optional: https://github.com/jackaudio/new-session-manager/commit/63e6...
- Set up symlinking by default in install: https://github.com/jackaudio/new-session-manager/commit/3681...
- Force the project onto GPL3, more serial numbers filing: https://github.com/jackaudio/new-session-manager/commit/2731...
After that is a number of fixes. Unfortuantely, from this list of "immediate" changes, it reads like the Argodejo developers decided they would be the preferred GUI, and decided to fork the project to abandon the current GUI. The README was even modified to this end: https://github.com/jackaudio/new-session-manager/commit/7f23... They also forced the project onto a different build system, and made new (and possibly incorrect) assumptions about installation. If the fixes came first (build fixes, etc.) and the other work came later, I would have a more-charitable view of this fork. Unfortunately, the immediate changelog sort of speaks for itself: they forked NSM, filed off all the names, changed over the licensing and build system, and ripped out the GUI. Then, a few months later, they actually started fixing bugs. The motivation here really seems to be subsuming ownership and default UI. This really just looks like a classic internet slap fight.
Of course, this is only conjecture from the git commit history, but... it's supported by the git commit history.