The slow-stabby-death in Saving Private Ryan was about a machinegun nest, not the sniper tower. The sniper tower, which held the sniper and his protection guy, got the shit blown out of them by an HE round from tank-hunter. Worst part of that is that the Sniper saw the tank hunter aiming at them and screamed for his protection guy to run, but it was too late. Bam. The Jewish guy the article talks about was either the gunner or the loader for the machinegun nest, not his protection. The problem with the machinegun nest was that they ran out of ammo because Corporal Coward, to use the article's term, was slow in getting there with fresh belts for the MG. They heard footsteps outside and, after calling out to see if it was Corporal Coward and getting no response, they shot the wall with their personal weapons, killing one German on the stairs. But, that shit works both ways and the other German shot back through the wall, one bullet catching the non-Jewish American in the throat. He bled out on the floor during the knife fight between the the Jewish Guy and the SS soldier. Corporal Coward was outside slowly walking up the steps and hearing fighting inside, but he was too timid to charge in and save them. Eventually, the SS trooper comes out, having won the fight with the poor jewish guy, sees Corporal Coward, immediately realizes this guy really isn't a threat to him and just leaves. Neither the Jewish guy nor his partner gave up without a fight and unless the sniper's protection guy could stop tank shells he doesn't deserve any blame either. Basically, the writers decided that a well-rounded group of characters need flaws, but instead of spreading them out, they basically just piled every flaw they could think of on Corporal Upham and called it good enough.
TL;DR: The article writer's memory of Saving Private Ryan is faulty and Corporal Upham (The Coward) deserves the blame that is getting lumped on the machinegun loader the writer assumed was a "protection" guy.