What is the author's style in 100 Love Sonnets = Cien Sonetos de Amor by Pablo Neruda?

As is a tradition with the love sonnet dating back to Elizabethan times and earlier, the speaker is the "I" speaking to "you" (his lover, here Matilde) in the second-person. This choice creates an intimacy, a kind of dispensing of the "fourth-wall" which engenders a feeling of genuineness and emotions truly and honestly felt. Second-person also creates the sensation (real or illusory) that the poems were meant or crafted for the sole benefit of the person who is "you," though of course the poems were eventually published for general consumption. The question arising from this second-person perspective is the degree to which the speaker is Pablo Neruda, and the degree to which "you" is Matilde Urrutia, or whether the reader wishes to completely divorce the work from the author and any stated authorial intent or biographical realities. The answer, as usual, probably lays somewhere in between. It would seem a fruitless endeavor to claim that Pablo Neruda is not expressing any of his own personal love to Matilde, and Matilde bears none of the qualities the speaker provides and praises. At the same time, the very nature of the carefully chosen prose and imaginative conceits dissuade the reader from concluding the poems are simply sprung full-form without the benefit of any filter or critical eye.