It sounds like that statement was expressing, in the author’s own words, this view expressed by Marx in 1847 in “Moralising Criticism and Critical Morality”.
“If therefore the proletariat overthrows the political rule of the bourgeoisie, its victory will only be temporary, only an element in the service of the bourgeois revolution itself, as in the year 1794, as long as in the course of history, in its “movement”, the material conditions have not yet been created which make necessary the abolition of the bourgeois mode of production and therefore also the definitive overthrow of the political rule of the bourgeoisie. The terror in France could thus by its mighty hammer-blows only serve to spirit away, as it were, the ruins of feudalism from French soil. The timidly considerate bourgeoisie would not have accomplished this task in decades. The bloody action of the people thus only prepared the way for it.“
https://marxists.architexturez.net/archive/marx/works/1847/10/31.htm