The readme says " The libraries in this repositiory are intended for KiCad version 5.x
Each symbol library is stored as a .lib and .dcm file pair."
But the repository contains .kicad_sym files!?
Or is there an assumption now in force that everyone contributing symbols will be using nightly unstable anyway!??
OK, well let’s hope 6.0 is released soon, if the changes in github/gitlab now effectively makes it impossible to contribute to the libraries with the stable 5.1.x series…