To be fair, the non-geographical definitions that excludes Britain, actually only excludes Britain because Britain excluded itself of the European Union in 2020.
And yet that website doesn't use the EU as a definition of European, so it clearly doesn't matter in this case. That's what I'm getting at: the word European doesn't seem to mean anything because the people who use the word the most are relying on definitions that yield unintuitive and self-defeating outcomes, like deliberately excluding one of the countries in Europe that actually does have a bit of a tech ecosystem.