With all due respect, that is nothing but a pure misconception. The third reikh was fucked pretty much the moment they attacked Belgium.
I don't know much about the eastern front but the reason they lost in their western offensive was due to their overconfidence they had about their blitzkrieg tactics .
If they kept their patience and attacked Batstone with proper planning and coordination they would have achieved a breakthrough in the battle of bulge and maybe outcome in Europe would have been different
Hitler was a bad tactician , everyone knew his orders were suicidal but no one dared to question him .
Many leaders on ground were great like piper, Rommel but were very overconfident . Their logistics were bad specially fuel , they were so overconfident that they didn't work on improving their fuel logistics and instead planned to rely on the allies fuel dumps that they would capture after overrunning their positions .
Also Luftwaffe proved to be ineffective due to their inexperienced pilots . Even then they planned a massive air raid on the allies but in turn lost more planes than them .
Also the weather was totally against them .
If they had executed their western offensive successfully ,they would have kept fighting for a few more years until USA would have nuked their ass .