By some mystery I had wiped the volume group and the physical volume in it. It was just a matter of recovering them using the metadata I could back-up using testdisk. I copied the original /etc/lvm folder on the Desktop of the live user, then
$ pvcreate --uuid "cZ83jX-WXkk-tNG4-ulGT-sAqq-HlKq-Omtqc8" --restorefile /home/liveuser/Desktop/etc/lvm/archive/VG.vg /dev/sda2 Physical volume "/dev/sda2" successfully created $ vgcfgrestore VG Restored volume group VG $ lvchange -ay /dev/VG/home /dev/VG/root /dev/VG/swap $ lvs -a -o +devices After that, vgdisplay -v fedora_pedro returned consistent output, mentioning the original logical and physical volumes, which I was allowed to mount and explore. A couple of minutes later, though, I unfortunately wiped the header of the luks container trying to write those changes to the disk. So all was done in vain...