Yes.
if you are poor paying 30% if your income makes you poorer to the point you might be unable to lead a life, when you make 5 million a year, paying 70% of taxes on that still leaves you wealthy with tons of disposable income to increase your wealth.
And wealth is related to hardwork? thats the biggest joke i've heard in a while, people who work 10h every day on 2-3 jobs would have a word with you.
There is a saying among wealthy people, "let money work for you".
I don't think a big part of those points are 'extreme" left at all, many are sensible, but I guess in contrast with normal US left, they might be.
when I read the title I sighed and imagined someones blog on tumblr complaining about manspreading and clapping being triggering mixed with white guilt and white hate or the modern "lets save everyone regardless of the cost to us and our society!" bullshit, I'm fairly surprised this is about actual left, not the mental illness that pervades modern "left".