GP referred to European countries outside the EU though; not 'the world ... outside of the EU'.

The EU forms 510/743 millions of people in Europe, so GP's point is more valid than you claim.

He also selectively quoted facts. 4/10 in the top 10 are EU countries.

Though if you want to actually look at the information all the nordics are in there of which 3 are in the EU and 2 are in the EEA.

GP's muddled claim was "Autonomy is crucial to happiness". Given Denmark (an EU country) is number two (and has been number one three times in the past), his claim is wrong on it's face.

Edit: and that's without even addressing the ridiculous straw man of "autonomy" (all sovereign countries are autonomous - no country is forced to be or remain an EU member against their will)