The thing is, the engine isn't ready, think of the description as planned features, they either aren't implemented or are in the works of being implemented, i'll most probably remove some stuff from the list once i realise how difficult some features may be to add. If you wanna see the progress Glunzunk Engine has made, goto the github repository, download the source code, install Python 3.11 or Higher(lower hasn't been tested most probably may work though), open your command prompt and type
pip install panda3d
and
pip install darkdetect
Then it should run without issue
An old but online version of GZ Engine can be found here
https://gd.games/itsicecreeperpe/glunzunk-engine
TL;DR : Engine not ready, features may or may not be added, test source to see engine yourself or use old but online ver -> here <-