Didnt know Qatar scored so high on GDP per hours worked metric, but I guess they dont measure hours worked in construction as that one is largely immigrants working in unsafe conditions with confiscated passports. Source - the book Inside Qatar.
But that's not entirely fair, since Africa to Europe may mean risking your life on a tiny boat, but Mexico to US is at least a land border.
Also UK gets it's share of life risking boats.
I guess Australia was the winner on this, until they took drastic measures to get people to stop risking their lives in tiny boats.
Also one should keep in mind the danger people subject themselves merely to go the last hop from France to UK.
That's a long way to say that the upstream comment was reading too much into this metric.