As a EU founder I think the article misses the two primary reasons Europe isn't doing well with startups.
1) Target market
USA: natural target market of 320 million people with a very high level of (disposable) income. Established businesses are happy to buy products from startups. There is a positive feedback loop where businesses try to grow fast and therefore want to outsource the stuff they're not good at so they can focus on their core skills. This means startups can pop up to take care of everything else (HR/Invoicing/Data crunching/etc-as-a-service).
EUROPE: you have to deal with dozens of languages and cultures. Although the and Germanic countries are OK with English-only products, the rest of Europe wants their products translated. Salaries are much lower here and businesses are much more conservative. Businesses that grow slowly have to care much more about operating expenses, which means they will try to do everything in-house to cut costs.
As a consequence we get the vast majority of our revenue from the US, even though people all across the world try our software.
2) Culture
A lot of people talk about starting a startup, but nobody seems to want it badly enough. Perhaps this is because there are so few success stories over here in the Netherlands. People tend to focus on the negative (what if you fail? what about work-life balance? what if you get sued?), but it's hard to say if that matters.
The US has only one Silicon Valley. There is nothing comparable on the east coast, even though the east and west coast have a lot in common. If we figure out why Silicon Valley works and other places fail to really take off we should be able to create startup hubs all across the world.