I have often heard ultra-lefts describe Marxists who oppose settler-colonialism and uphold AES as being "Third Worldists".
Looking at what people like Jason Unruhe have to say about the topic, Third Worldism does not seem entirely baseless (e.g. the proletariat in the imperial core more often being labor aristocrats).
So, what are our thoughts on Third Worldism?
I have never considered it that way. Although, to be fair, Stalin did comment on the need for each country to have their own revolution done by themselves without direct intervention from socialist states.