Of course the writer is correct and I thought the same thing when I read that book.
I do remember one scene near the end when the main character is looking down at some small-town scene from a hilltop (or something like that) and he can hear laughter of children in the distance and he thinks to himself that he stole Lolita’s childhood.
Yes, that’s pretty much the point of the book. Humbert hears the laughter of the children and realizes his sad feelings are not those of missing Lolita, but those of realizing he has stolen her childhood.
But the reader is roped in with the sex aspect. One can only hope most readers walk away with some new understanding.