I was told by other Muskovites that at a conference with his subordinates in the Kremlin, Stalin said that there were no troops in Moscow and that the Soviet Siberian and Far-Eastern troops were on their way to Moscow to defend it. Until then, he said, the Muskovites should start leaving Moscow on their own as soon as they could.
The result was what came to be called the "Big Skedaddle." Anyone who could, skedaddled. My mother and I skedaddled on the evacuation train reserved for Moscow writers, since my father was a writer, who had volunteered for the front.
My God! Is it possible that Hitler knew nothing about what was going on in Moscow?
Well, since Hitler was a villain, most of his biographers present him as a pure villain. Yet every villain has crumbs of innocence in himself. Hitler believed that espionage is below "the warrior's nobility": every native of a country who becomes a foreign-country's spy is a traitor to his country.
Hence Hitler did not know what every Moscow teenager knew. Hitler's soldiers could walk into Moscow, but they loitered outside the city until the Soviet Siberian and Far-Eastern troops did come — and routed them!
Thus Hitler had lost the war, the fact he was trying to conceal up to his suicide. SOURCE
Hitler and espionage
Columnist Lev Navrozov suggests that Hitler lost Moscow because he did not believe in espionage: