If true, it makes the magazine come out even worse. The Haitian Revolution was followed within a year by the massacre of most of the European population, a few selected demographics aside.[0] This was already well known down the long decades to that 1938 book and today. So, the mag closed its eyes to a reign of terror no better than the 1789 French revolution.

As for the controversy of Jacobin ideologically, the magazine typically takes a Marxist standpoint, but not all leftist schools of thought are Marxist.

[0] https://en.wikipedia.org/wiki/1804_Haitian_massacre