Also, the reviewer seems not to have noticed that the sentence itself is an homage to Lolita directly echoing Humbert's little list of under-thirteens, which included both and Dante's Beatrice as well without the caveat that Dante was Beatrice's same age.

Here is a lengthy quote from my Library of America edition of Lolita, pgs 16-17 "Marriage and cohabitation before the age of puberty are still not uncommon in certain East Indian provinces. Lepcha old men of eighty copulate with girls of eight, and nobody minds. After all Dante fell madly in love with his Beatrice when she was nine, a sparkling girleen, painted and lovely, and bejeweled, in a crimson frock, and this was in 1274, in Florence, at a private feast in the merry month of May. And when Petrarch fell madly in love with his Laureen, she was fair-haired nymphet of twelve running in the wind, in the pollen and dust, a flower in flight, in the beautiful  plain as descried from the hills of Vaucluse."  Also, on page 100, "Oh, Lolita, you are my girl, as Vee was Poe's and Bea Dante's..." This is when Hum is buy clothes for Lo after Charlotte's death when he goes to get her from camp Q. Anyway it seems obvious Salter had Nabokov's book specifically in mind. It isn't an info-dump in the ordinary sense that this term refers to narrative information or exposition while the type of thing Salter seems to be doing is elaboration and justification, which what Humbert is doing but might be odd in third person, one would have to read the quote in context.