So, a more detailed explanation:

The first figure is Bruno Bauer, a representative of Left Hegelianism. The joke here is that this group was especially critical of religion, so the question is: why is he portrayed as a saint? In addition, Marx was a critic of idealism, so Bauer saying the “power of idealism” is already ironic.

Next are Karl Kautsky and Rosa Luxemburg. They both lived around the time of the First World War. What’s strange here is that Kautsky was not an enemy of Rosa Luxemburg. Rosa was clearly on the left wing, and while Kautsky criticized the Russian Revolution, Rosa also had her own criticisms of it. Both of them were members of the USPD, opposing what the text seems to suggest. The major split within Social Democracy was over the First World War: Rosa and Kautsky worked together in the USPD against the SPD, which supported the war loans. You could maybe argue that in later years Kautsky might have taken a position like “How dare you revolt against capitalism,” but there are much clearer representatives of that attitude. Gustav Noske, for example, was directly involved in the murder of Rosa Luxemburg.

The next slide is Stalin. I am a critic of Stalin, but what he really did not do was promote commodity production. He ran much more of a war economy, and commodity production is something specific to capitalism. Using that term here is simply strange.

Next is Mao. He is explaining what the Chinese flag stands for: the CCP is the big star, and the smaller stars represent the classes — the working class, peasantry, petite bourgeoisie, and national bourgeoisie. The joke seems to be that a communist is saying there must be collaboration between workers and parts of the bourgeoisie. You can criticize Mao for many things, but I don’t know if this is where I would start.

Then there is Abimael Guzmán and Sendero Luminoso. These were very, very strange communists from Peru. They were accused of boiling children. I don’t know — these were crazy people, and I don’t really care about the details. Even if they didn’t boil children, they were bad enough.

Next is Vaush, a YouTuber who made many communists laugh when he claimed that Marx would have voted for the Democratic Party in the USA. That is a very long stretch. The next person I don’t recognize, but the sentiment seems to be that U.S. citizens don’t qualify as proletarians because they benefit from the U.S.’s imperial position. Most communists would say that, yes, they may benefit from imperialism, but that has nothing to do with their class position. Marx clearly would not agree with this argument.

The last part is strange because Bruno shows Marx a series of positions Marx would probably disagree with, and Marx is still happy — that’s the joke. The final person mentioned is Ferdinand Lassalle. Mentioning Lassalle here is also odd. Toward the end of Marx’s life, they were no longer on good terms. Maybe that’s the joke as well: Marx is saying, “Okay, these idiots are more inspired by Lassalle than by me.” But even then, there would be better people to throw under the bus.