When people say authoritarianism it is reliably synonymous with totalitarianism as defined by Hannah Arendt, which is basically horseshoe theory, where fascism and communism are equivalated.

https://en.wikipedia.org/wiki/Authoritarianism#Examples

There is no one consensus definition of authoritarianism, but several annual measurements are attempted, including Freedom House's annual Freedom in the World report. Some countries such as Venezuela, among others, that are currently or historically recognized as authoritarian did not become authoritarian upon taking power or fluctuated between an authoritarian, flawed democracy, and hybrid regime due to periods of democratic backsliding or democratization. Nazi Germany and Stalinist Russia are often regarded as the most infamous examples of "totalitarian" systems. Some countries such as China and various fascist regimes have also been characterized as totalitarian, with some periods being depicted as more authoritarian, or totalitarian, than others.

Hannah Arendt came from a wealthy family and was unsurprisingly anti-communist. Her work was financially supported and promoted by the CIA. The CIA and the Cultural Cold War Revisited

U.S. and European anticommunist publications receiving direct or indirect funding included Partisan Review, Kenyon Review, New Leader, Encounter and many others. Among the intellectuals who were funded and promoted by the CIA were Irving Kristol, Melvin Lasky, Isaiah Berlin, Stephen Spender, Sidney Hook, Daniel Bell, Dwight MacDonald, Robert Lowell, Hannah Arendt, Mary McCarthy, and numerous others in the United States and Europe. In Europe, the CIA was particularly interested in and promoted the “Democratic Left” and ex-leftists, including Ignacio Silone, Stephen Spender, Arthur Koestler, Raymond Aron, Anthony Crosland, Michael Josselson, and George Orwell.

The authoritarian states are whichever states the Council on Foreign Relations deems authoritarian this month. It just means “governments that Global North capitalists want regime changed,” and that’s usually because the authoritarian government is blocking their access to neocolonial profit-making.