Those things are much more radical than anything you see in Europe, he isn't left-liberal, he is about as far left you can go without being outright communist. Note that I myself support left-wing liberalism very much, I want public healthcare, strong separation between religion and state, free speech etc, that isn't what makes Sanders far left, it is all the other things he also wants to do.
Everything I mentioned here is all on his homepage: https://berniesanders.com/issues/corporate-accountability-an...
This is already the case in Germany: https://en.wikipedia.org/wiki/Codetermination_in_Germany
Also, if it was just the 45% worker representation on boards and not the other things I'd consider him traditional left. It is a bit further than what you can find in Europe, but not overwhelmingly so, however all those combined is.
That doesn't apply to every European country though. I live in Poland, where left-wing parties have struggled to enter the parliament for many years now and the main fight happens between liberal right and far right. The US scene, although different in several important aspects, appears somewhat similar in this regard. We also have some individuals in the major liberal right party that could transfer into a left-wing party without raising too many eyebrows.