It has been neoliberal biased for ages. For example this is a 2021 article calling out their neoliberal bias. https://aninjusticemag.com/the-inescapable-neoliberal-bias-behind-kurzgesagt-in-a-nutshell-215eb1e9b70f?gi=9574bf28f4a0

But it has undoubtedly gotten a lot worse recently. That south korea video was abymaly blind and baked in unrealistic capitalist assumptions.