After reading this, I still don't know what the essential features of Marxism are, nor how they relate to Labour and/or Jeremy Corbyn. I am not necessarily saying you're wrong, there's just not enough substance there to either agree or disagree with.
Take "property is theft." Ok, not strictly Marx but some other bloke around the same time. After the horrors of Grenfell Tower Corbyn's first response was to exploit the situation and suggest seizing people's property. Of all the ways we could help those unfortunate people his first reaction
was to attack the rich. Very much out of the Marxism for Dummies
playbook: get people all foaming at the mouth and let them loose.