If Hitler is a communist he probably doesn't come to power. The reason the likes of The Nazis got funded for their elections, was because they weren't Communists. If you take away Hitler's funding he won't get the same exposure.
I do think Hitler could be a communist if it meant he personally got into power because I believe Hitler's Narcissim trumps his chore beliefs. Hitler's use of populism and ability to stir up hatred could be shifted to the upper classes. The German Communist Party was also anti-semitic so I'm sure he pushes this further. Hitler would ofcourse blame Germany's problems on the wealthy and 'Jewish Bankers' would undoubtadly be a tool he'd use.
They probably would have said that about the Bolsheviks if a white victory occurred. People underestimate popular will in history. Bolsheviks didn't have major backers and infact the entire western world opposed them, yet they created the Soviet Union. People think way too rigidly with alternate history, and I think people who shut off such possibilities would find aspects of this current world (assuming they lived in an alternate world) impossible.
"no way could have the red army won, the entire western powers backed white army and the white army had all of the experienced officers!"
"how did the chinese communists win! they had a fraction of both the manpower and firepower of the nationalists? Even assuming the soviet support they got, this is total asb!"
"how did cuba go communist? Monroe doctrine and foreign economic domination outright prevent that!"
See all three of these movements won due to popular support. Hitler in this scenario retains his excellent oratory skills. However, no Hitler isn't much of an anti semite in this TL. Why do people assume he must retain anti semitism to be a bastard? Mao and Stalin weren't anti semitic, they were bastards.
The Cliche of people assuming this Hitler goes strictly and rigidly Nazbol is kinda annoying.