Which of those countries he referenced actually isn't a shithole?
(1) newsflash - most of the world is a shithole, the places that aren't shitholes are a few exceptions. You don't see presidents going around calling other countries shitholes. It's not what presidents do.
(2) The fact that he said immediately after that "we want more people from Norway" doesn't help the case, what he said was out of racism. The fact that Russia is a shithole and he is perfectly fine with pregnant Russian women coming to his properties to pop out a baby and come back to Russia so their baby is theoretically a US Citizen also makes it obvious this is about race.
Now, if people are going to say "well, because that race (Russians, slavs) is better", like they're saying "well, those countries are shitholes", at least the discourse will get more honest: It's about race.
despite being one of largest producers of oil on the world and nearly 3x the population. Russia has a smaller economy than 0 resources South Korea.