You are correct there is no hard core border on the left. No matter how light you are with the big government touch and communal ownership, it eventually becomes totalitarian and murderous and complete loss of private property.
Hitler was a communist in 1917 before he became fascist and he leaned back to communism once he was securely in power. China also has equivocated between communism and fascism since the revolution. The became fascist to encourage investment and are now heading back towards communism under Winnie.
Hitler was not a communist.
Claims like this are weird.