Unfortunately, there is virtually no communication from the developer.
On GitHub, 2.0.0 says ‘pre-release’ and ‘may contain severe issues‘. The release notes for 2.0.0 also say the MI (mutable instrument) stuff doesn’t work.
On github, Axoloti-1.0.12-2 is marked ‘Latest Release’
It has been almost a year since Johannes put the 2.0.0 pre-release package on GitHub. I see little evidence this project is moving forward in any useful way.