No, the Marxism is in having kids at the top being leveled down because of the kids at the bottom in the name of "equity" / equality of outcome.

"Equity is a noble goal, but it should be obvious that taking away resources from smart teenagers in order to make them more similar to their lower-achieving peers is the height of idiocy."

Nah, we saw what happened with No Child Left Behind. They replaced education with test-prep. The schools who performed poorly got their funding cut or closed altogether. The schools who performed well got more funding. They took resources from the kids who needed help, and gave them to the kids who were already succeeding.

That’s not what Marxism is

The truth is that Marx is a boogeyman and it's easier to summon a century of propaganda than formulate sound criticism of a policy.

Or many of us are just trying to find out a proper term and qauntify an ideaology that keeps rearing it's ugly head every few months or so using a different buzzword.

This ideology comes straight from the totalitarian outcome of the French revolution and its thinkers, eg. J.J. Rousseau, Robespierre, but also from the Catholic church itself. The Vatican "pezzonovante" preaching for poverty vows while sitting on solid gold shitters in luxury palaces build by slaves, not much different from modern day "celebrities" flying private jet to their luxury houses while preaching the "green new deal".