You'd have to specific about which ideas are being used to justify colonialism and where their lineage is, racism after all was one such justification, yet it was rooted more in classical antiquity era thinking than debates regarding German Idealism. Economic interests are another, but once again, that's pretty explicit and consistent.
I mean, it’s in the article. The Siamese Kingdom put on the trappings of western modernity because the lack thereof was being used as an explicit justification for colonization under a “save the savages” type zeitgeist.
