The letter signers you posted say they are from the center for evolutionary psychology, departments of anthropology and psychology. This is the whole problem, they have one foot (if not both feet) outside of science and in social science.

Yes, he said that, but he said it in the context of giving descriptions of what those evolutionary biologists were doing that were completely disconnected from reality.

> The letter signers you posted

Are an anthropologist and a psychologist, yes. But the criticisms of Gould that they describe are by no means limited to those fields. The names they list in footnote 2, for example, are a roll call of major evolutionary biologists of the 20th century. Those people are not "outside of science"; they are right in the middle of the scientific field that Gould portrayed himself as an expert on, and they all say Gould's claims are nonsense.

  My original reasons for writing The Mismeasure of Man mixed the personal with the professional. I confess, first of all, to strong feelings on this particular issue. I grew up in a family with a tradition of participation in campaigns for social justice, and I was active, as a student, in the civil rights movement at a time of great excitement and success in the early 1960s. (p. 36)

Wilson specifically used the term "socialism". The full quote is given here:

https://en.wikipedia.org/wiki/E._O._Wilson#The_Ants,_1990

It seems that what Marx called socialism is basically communism.

By 1888, Marxists employed socialism in place of communism as the latter had come to be considered an old-fashioned synonym for socialism. It was not until after the Bolshevik Revolution that socialism was appropriated by Vladimir Lenin to mean a stage between capitalism and communism.

https://en.wikipedia.org/wiki/Socialism

Many people (including me) would say that there isn't any meaningful difference between the two, whether we are talking about Marx's time or any time since. I don't know whether Wilson thought there was any meaningful difference between the two; as far as I know nobody asked him.

The two terms were more or less synonymous when Marx wrote. Later ideologues have attempted to differentiate them; whether or not they have succeeded is a matter of opinion.