The OG claim
They had whole units whose sole job was to kill other soviets who retreated from battle
Fuckchecked by your link
Umm akshually, at best, you have a 1.7% (278/15649) to 4.2% (1000/24000) chance of getting shot, for unauthorized retreats in PENAL units, the majority were returned to the battlefield, or otherwise imprisoned, sent to other penal units.
Thus we find this claim extremely misleading, if not false, sweaty