I not remember exactly what is the driver version , but installing nvidia driver previous version before 05-2021 in installation is displayed a option to choice install 4 libglvnd.
Since driver 465 not is displayed any option to install libglvnd.
Not has any information in readme about if is being installed libglvnd.
Installing nvidia driver need before install libglvnd-dev ?
I have tested installing libglvnd-dev and after start the nvidia driver install.
In the link below
Have a detail
" Support for non-GLVND OpenGL and EGL libraries on Linux
The release 430 series will be the last to support installing Linux OpenGL and EGL client libraries that do not use the GL Vendor Neutral Dispatch (GLVND) loader library."
The detail above is related with libglvnd ?
I only wait understand if is really required libglvnd to OS and softwares work without issues.
Have a nice day.