the link still not work,
possibly as you have a private profile?
https://gitlab.com/BenDewalle/ ?
and you made us registering there?
can you just post
template.pyde
here
also a template name should be
sketch.pyde
and the user has to copy it to
/../Processing/modes/PhytonMode/template/sketch.pyde
or
/../Processing/templates/python/sketch.pyde