Excellent! Finally someone had actually opened what the communists' plan is. So, I agree, let's read that passage carefully. What do we see?
1. A prediction: "Но ведь само собой разумеется, что с уничтожением нынешних производственных отношений исчезнет и вытекающая из них общность жен". So, by the 30s the "present system of production" had been totally destroyed. Had the "community of wives" became "open" by itself? No. Thanks to Stalin the family was preserved and even declared important.
2. An explicit plan: "они хотят ввести вместо лицемерно-прикрытой общности жен официальную"
So, if the communists want the community of wives become official and it does not [SURPRISE!!] happens on its own, how the community of wives would become official?
Answer: by force, like everything else the communists had done.
Do you remember that the very first communist government included a very interesting member Alexandra Kolollontai who had openly promoted 'free relationship' and the community of wives. She was very popular [because she gave a brilliant example of how that should be done] but that didn't go anywhere en mass. Lenin didn't push it and Stalin fought it. By the 80s a person could be expelled from the party for the regular adultery.
So far so good for the 'brilliant theory' by Marx.