The general usage of "third-world" has changed over time to be focused more on development than on whether a country was pro-USA or pro-Soviet.

If one were to hold to the original meaning of "third-world", then one would have to class Namibia and Angola as "first-world" countries while classing Switzerland, Ireland, Sweden, and Finland as "third world". Something that clearly goes against the current general usage of the term.

I wasn't aware of the original meaning. From Wikipedia[0]: "The term "Third World" arose during the Cold War to define countries that remained non-aligned with either NATO or the Communist Bloc. The United States, Canada, Japan, South Korea, Western European nations and their allies represented the First World, while the Soviet Union, China, Cuba, and their allies represented the Second World. This terminology provided a way of broadly categorizing the nations of the Earth into three groups based on political and economic divisions."

[0] https://en.wikipedia.org/wiki/Third_World

But it's how it's used now. But yes, it's not in original meaning of a word.

But based on original meaning Switzerland is third world country which also does not sound right.