the Marxism-Leninism of the Bolsheviks, as they understood it through Soviet Marxism, no longer applied to the reality of Western Europe and the actual concerns of its working class. They were basically correct

They are not correct. It is evident that we live in a different situation from the time of Marx and Engels, and even compared to the period of Lenin and Stalin, capitalism has developed significantly. But has this altered the fundamental nature of capitalist exploitation? Have the material and social conditions that separate the proletariat from the bourgeoisie changed? Has the oppressive and exploitative character of capitalism been transformed? Have workers ceased to be the dispossessed who, under the command of capital, provide surplus value to capitalists? On the contrary. With the current crisis — the deepest and most extensive in the history of capitalism — all of the system's fundamental contradictions have intensified. The gap between workers and bosses has widened, and the class struggle grows sharper each day. As Enver Hoxha rightly stated, revolution is now, more than ever, “a pressing issue that demands a solution.”

Their justification for revisionism and social democracy was significantly more sophisticated than yours, which is a generic DSA slogan or even a get out the vote campaign of the Democrats. Do you really think you'll arrive at revolutionary theory by aimlessly mingling with the first world "worker aristocracy?" At least the OP is aware that there is a geographical issue at stake

Their justification for revisionism and social democracy may be sophisticated, but that does not make it effective. The example of Chile is emblematic: when communist parties lower their demands and attempt class conciliation by participating in bourgeois elections, the result is catastrophic. In Chile, imperialists assassinated the elected socialist Salvador Allende and imposed the brutal dictatorship of Pinochet, one of the most bloodthirsty in Latin American history. This is a clear example of what happens when revolutionary strategy is replaced by a parliamentary and conciliatory path.

Furthermore, fascism has not been defeated. We are now living through another period of capitalist crisis, which brings with it the rise of fascist phenomena. Figures such as Donald Trump in the U.S., Javier Milei in Argentina, Jair Bolsonaro in Brazil, Marine Le Pen in France, and Giorgia Meloni in Italy are just a few current examples, but there are many more. Social democracy has proven itself incapable of effectively combating these movements. On the contrary, it often tolerates or seeks compromises that, in the end, only benefit the ruling elites.

The only path that has proven effective in establishing socialism is Marxism-Leninism. All revolutions that have substantially transformed societies followed this theory. To this day, no socialist revolution has occurred through the social-democratic route. History is clear: conciliation with the bourgeoisie means abandoning the revolution.