No need to reinstall, your problem comes from here
#dtoverlay=vc4-kms-v3d,cma-512
#https://discourse.osmc.tv/t/howto-install-a-vnc-server-on-the-raspberry-pi-currently-not-working-on-the-pi-4/1517/472
dtoverlay=vc4-fkms-v3d,cma-512
The fkms seems not to provide any audio device.