Those details about the Netherlands don't actually form an argument in my view, other than "look how much tax there is". And your additional arguments still just boil down to "we should not tax high levels of wealth" so heavily.

I'm not saying that sentiment is wrong (although I absolutely do disagree with it), I'm just saying that this article is disguising "too much tax!" as "look, I've identified an interesting pattern in European policy and causally linked it to Europe's less successful startup scene".