The author seems to be saying that the only solution to this contradiction is replacing "locational liberalism" with a universal, global liberalism. So he correctly diagnosed the hypocrisy but proposes a completely inverted solution to it. Rather than trying to export "Democracy" and liberalism to the Third World, we should be countering multiculturalism and radicalism at home.
I would also say that the real reason that the Left supports ethno-nationalism (along with religiosity, social conservatism, and militarism) for non-western societies while condemning these things in western societies is that their real ideology isn't about love of social liberalism, but hatred for Western culture. Supporting multiculturalism and social radicalism at home helps rot America and Europe from within, while supporting ethno-nationalist Third World movements helps destroy us from without.
It's also interesting to see how the multicultural Left treats Russia. Because of residual love for the Soviet Union and Russia's antagonism with NATO, some on the American and Western European Left are still sympathetic to Putin. However, as far as most liberals are concerned, Russians are too white and too Christian for them to embrace as anti-western allies in the way that they embrace nationalistic African, Arab, or Meso-American strongmen.
You're both wrong. The only answer is the One True G-d and his Laws universally applied.
I wouldn't expect a "palaeo" to understand.