He’s not arguing that British soldiers were not capable of acting amazingly, even the Germans tipped their hats to the ability of the British Tommy to dig in and stubbornly hold, it’s that ability if the Heer to in an almost fluid nature, collapse units, reform and fight on that’s the issue.
The Russians were always acutely aware of the ability of the Heer to recover and get back on the front foot if you did not completely rupture their front.
An example oft cited is in the attack. A British tank crew who’s tank was knocked our would walk back to their jumping off point, a Panzer crew were expected to grab their personal weapons and join the nearest infantry and go forward. For the German army, your ‘trade’ seemed to be just a temporary state of affairs for an infantryman first and foremost, not wether you were destroying tanks with a Panxer Or a Panzerfaust.
We can argue that’s a wrong use of trained tank crews, but it did mean the Germans often had more troops in the fight than they had on paper - this is the point I think Stonker is aiming at, the uncanny ability of the German army to think on its feet even at the lowest level. Yes, the Battle of the Admin box was a great feat of arms, but a German Officer or NCO seeing a breakthrough, Would simply do the same with any units nearby and add extra infantry to his attack.