There's not really a universal definition of unicorn. At its origin and most basic it was just a private company over 1 billion in valuation. Since then, various sources have tried to amend it so that its "private startups" but there's not really a good definition of startup either.
Founded in 2000 or later seems odd definition for a "unicorn", the last one on the list, vente-privee was founded in 2001, that's 4 years before YouTube (2005), a year before LinkedIn (2002)... doesn't a unicorn loose its unicorn status after some point if not going public?
Speaking of going public, not quite sure how up to date the list is, UiPath, which is about to go public, is headquartered in New York, USA, so does it still count as a Europe unicorn? :https://www.bloomberg.com/news/articles/2020-11-14/software-...