I usually see it called Foundations of Leninism (and there's a great audiobook that I listened to that used that title), so it's possible your translation is weird. AB is right, Stalin wrote very bluntly and with a sense of severity, though I don't think it's normally all that confusing or anything. Maybe a bit under-explained, though.
I think this was the audiobook, since I've listened to a lot of this guy's readings: https://www.youtube.com/watch?v=sPC5ADHHbSk