Potential History and his quixotic takes on WW2 are insufferable. His videos are littered with a ridiculous number of errors, and yet you still see them being posted everywhere by edgy teenagers. PH has become a leader of this cargo cult of faux historians, vaulted to the top by his ignorant followers. His work is representative of the 'meme history' that has become all too popular on Youtube and other websites. Teens today have a bizarre need to distill their understanding of literally everything down into meme format. This behaviour is very jarring to encounter: It seems to leaks into almost everything they do. Anyway... According to PH, the Germans capturing Moscow would have absolutely no affect on the outcome of the war. Why does he think that? Because, he draws an utterly facile comparison with the French capture of Moscow in 1812 (which did not yield a victory).
The fact that he thinks this illustrates just how little PH actually knows about history. How can someone talk so much about a subject while knowing so little? He doesn't understand how different these two wars were. The Germans did far more damage to the Soviets in 1941 than the French ever did to the Russians in 1812. Why? Because the Heer advanced over a much broader front than the Grand Armee, sowing unimaginable chaos and destruction along the way. [1] The Soviets left nothing untarnished in the wake of their retreat. Scorched Earth tactics can be hit or miss, because you have to burn down the farms & towns that are directly in the path of an invading army. This works fine if an enemy is only moving through a small part of your country (as Napoleon did). But when an invading army is moving across a large part of your territory, scorched Earth tactics will cripple you. The Soviets found this out to their chagrin during the war, when their economy was pushed to the breaking point.
PH also ignores how much larger and more important Moscow was in 1941 as compared to 1812. If Hitlers marauding thugs had captured the city, it would have had grave consequences for the Russians. This was explored in a wonderful book by David Downing, called The Moscow Option. He uses the Operation Typhoon in August 1941! trope [2] to show how enormously disruptive Moscows fall would be to the Soviet railway net, and their ability to deploy and supply their field armys. (Among other things, it would lead to the fall of Leningrad) Losing both of their capital citys would be a huge blow to the prestige of the Soviet Union, and would seriously hurt the Red Armys morale. Another thing PH ignores was Stalins declaration that if the Germans captured Moscow, he would be forced to make peace with Hitler.
[1]The Germans were also able to fight decisive battles with the Red Army close to the border, which is something that the French were unable to do. The Russians kept escaping from them and retreating deeper into the interior, where their resistance would have a more meaningful impact on an overstretched invader.
[2] This particular scenario has come under alot of skepticism in the last decade or so, with critiques coming from David Glantz and David Stahel.