I was similarly puzzled, as I’ve never heard of these two men before, let alone the criticism of them.
After skimming both of their Wikipedia entries, here’s what I found that I think is relevant:
from Peter Kropotkin:
Kropotkin disagreed in part with the Marxist critique of capitalism, including the labor theory of value, believing there was no necessary link between work performed and the values of commodities. His attack on the institution of wage labor was based more on the power employers exerted over employees, and not only on the extraction of surplus value from their labor. Kropotkin claimed this power was made possible by the state’s protection of private ownership of productive resources.[55][56] However, Kropotkin believed the possibility of surplus value was itself the problem, holding that a society would still be unjust if the workers of a particular industry kept their surplus to themselves, rather than redistributing it for the common good.[56]
Kropotkin believed that a communist society could be established only by a social revolution, which he described as, “… the taking possession by the people of all social wealth. It is the abolition of all the forces which have so long hampered the development of Humanity”.[57] However, he criticized forms of revolutionary methods (like those proposed by Marxism and Blanquism) that retained the use of state power, arguing that any central authority was incompatible with the dramatic changes needed by a social revolution. Kropotkin believed that the mechanisms of the state were deeply rooted in maintaining the power of one class over another, and thus could not be used to emancipate the working class.
Élisée Reclus doesn’t have nearly as much about his Anarchist beliefs, focusing more on his anti-marriage, nudist, and vegetarian/vegan leanings. He is associated with Kropotkin, so it’s reasonable to conclude that they held similar beliefs regarding economics.
My conclusion is that the meme is a bit of Appeal to Authority, as neither Kropotkin nor Reclus were economists, both being Geographers.
From Geographer:
Geographers do not study only the details of the natural environment or human society, but they also study the reciprocal relationship between these two. For example, they study how the natural environment contributes to human society and how human society affects the natural environment.[3]
That’s certainly more relevant than my initial guess as to what a Geographer is/was. I’m not qualified to determine whether or not their conclusions about Marxism/Socialism are correct or accurate, but assuming that a Scientist will be 100% Scientific in their methods is probably naive.
ETA: Whether it’s a good meme or not, I learned a little bit about some historical figures and their profession than I knew previously, so that’s something at least.