When the Battle of Stalingrad ended Feb 2, 1943, with the defeat of the Wehrmacht, historians note that the war was essentially over and Hitler knew it.
Unable to rid the world of Bolsheviks, Hitler turned to Plan B, the effort to rid Europe of Jews.
True, Hitler was a psychopathic mass murderer, probably afflicted with tertiary-stage syphilis (significant brain damage, fits of rage etc.), but this is history.
My only quibble with Trump saying the Russians defeated Hitler is that Stalin may not have succeeded without massive shipments of aid from the U.S.
“Lend-lease” was sold to Americans as aid for the U.K., but most of it went to the USSR along with nuclear materials. This was orchestrated by one of Stalin’s agents in the WH, FDR’s “Co-President” Harry Hopkins.
As a footnote, according to Soviet defector Ken Alibek, the USSR used biological weapons to halt the German advance. This was Tulerimia, only 10% fatal but rendering a far higher number extremely ill, requiring a 6-week halt in the Blitzkrieg so they could be cared for...allowing the Russian winter to set in.