So, after checking with cfdisk, I can see that /dev/disk/by-id/ata-ST16000NM001J-2TW113_ZRS1QMPT still has only 2 partitions instead of 3 and there's no BIOS boot partition in sight.
But what else am I to do?
I took a healthy disk, gave its partition table to the unhealthy disk (using sgdisk)...