The info is simply wrong. WW2 advances supplied by road rather inevitably petered out around 400-500 kilometres from the nearest port or railhead, due to exponential transport requirements.
When you look at the distances between the major ports of Libya and Egypt, they tend to be around that limit, meaning anyone advancing eastward has a hard time as they were very much at the end of their tether, and the defender was sitting on a logistics hub.
The British, having actually paid attention to this issue both prior and during the war, appropriately invested in Egypt's infrastructure and their own forces logistical assets (both material and personnel) so they could better avoid this problem. This is why the Eighth Army was always significantly larger than the Axis forces in North Africa, which was decisive in stopping Rommel at Alamein.
Which, aside from being predicated on the Germans breaching defenses they physically do not have the forces and supplies to breach, is also predicated on them taking Alexandria and those dumps
intact. Both of these essentially require more then the British substituting lead time for tea time: it requires God to descend from the heavens and grant the Germans unlimited tanks, men, and fuel.
And we do have a forum for that...