Being a linguist in training, there's no way that I'm believing it. You cannot tell what someone's voice sounded like by the shape of their head. That's malarkey. The height of the roof of her mouth, her tongue size, shape, and flexibility, her lips, and her distinct vocal chords would have way more to do with it. Also, we'd have to know exactly 1) what language(s) she spoke and 2)what that language sounded like when she spoke it-- which there is no exact way to do, we can only guess by remaining rhyme schemes in poetry, meter, surviving languages. Also, her distinct pattern of talking and accent would be impossible to recreate.
And need I say that they're working off a painting and, oh, I don't know, I doubt Da Vinci's purpose was to be scientifically accurate on her skull shape.
That is pretty cool about the guy being able to age a voice by ten years leading to apprehending a criminal. That is possible. And as for recreating voices, well, he has their real voice to compare it to and tweak it.