It seems worth distinguishing "has something in common with Marx's ideas" from "is fundamentally Marxist", especially as "Marxist" is a pretty inflammatory term because of the horrors perpetrated in the name of Marxism in the 20th century.

So, what are these ideas you're calling fundamentally Marxist? I think it comes down to this: "Sometimes one group of people has more power and resources than another, and acts in ways that harm the worse-off group. We should frame such situations in terms of conflict between the two groups, even though some people in the worse-off group may not see it that way."

I'm not sure I'd want to endorse those ideas, but they seem to me to fall far short of justifying the description as "fundamentally Marxist".

certainly anticapitalist

Advocating more regulation of markets is not at all the same thing as opposing capitalism. I think you are confusing capitalism with, I dunno, libertarianism or something.

Capitalism means having lots of privately owned industry and trade. Anyone who isn't advocating large-scale nationalization, or something more drastic than that, is not being anticapitalist in any useful sense.