from what i can tell from there:
Voice masculinization is the opposite of voice feminization, being the change of a voice from feminine to masculine. Voice masculinization is not generally required for transsexual men as the masculinising effects of testosterone on the larynx are usually sufficient to produce a masculine voice. However, Alexandros N.Constansis has stated that "Apart from being unfair to transmen, is also overtly simplistic" and cites Davies and Goldberg in saying that "testosterone doesn’t always drop pitch low enough for FTMs to be perceived as male".
some transmen may also need vocal training to lower their voices, however looking at the section on actual surgical interventions further down the page, they seem to all be aimed at raising the vocal pitch.
so in the case of the BB contestant above, probably a mix of hormone and training, depending on how high and/or feminine his voice was beforehand.
i have an art blog: http://procrastinationathon.blogspot.com/
and a review blog: http://blindwithwoodenhands.blogspot.com/
double blog! what does it mean?